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989 beginning ASP NET 4 in c 2010

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Beginning ASP.NET 4 in C# 2010
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Beginning

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ASP.NET 4 in C# 2010

Matthew MacDonald,


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Welcome to the most up-to-date and comprehensive beginning ASP NET book
you’ll find on any shelf. As you probably already know, ASP.NET is a framework
for developing modern web applications. In the right hands, ASP.NET produces
web applications that are secure, blisteringly fast, and highly scalable. Best of
all, ASP.NET includes a huge set of ready-to-use features like website navigation, data binding, themes, and user management. ASP.NET allows you to create everything from a dynamic personal website to a full-scale e-commerce
storefront.
In this book, I assume that you have only basic knowledge of C#, although
those coming from a more experienced background will find that the basics are
reviewed quickly and efficiently. As you explore ASP.NET, you’ll learn the key
database, security, and performance principles you need to know in order to
design a solid web application. My book will also teach you to use techniques
such as object-oriented programming and code-behind development from the
beginning, rather than fake it with simplified techniques that won’t work well
in real life.
Once you’ve reached the end of the book, you will have mastered the core
techniques of website programming, and you’ll have the knowledge necessary
to begin work as a professional ASP.NET developer.

THE EXPERT’S VOICE ® IN .NET

Beginning

ASP.NET 4
in C# 2010
Start your journey with the fundamentals
of building ASP.NET websites

Matthew MacDonald

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Beginning ASP.NET 4
in C# 2010

■■■
Matthew MacDonald

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Beginning ASP.NET in C# 2010
Copyright © 2010 by Matthew MacDonald
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For my wonderful family,
Faria, Maya, and Brenna

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■ CONTENTS

Contents

About the Author .................................................................................................. xxv
About the Technical Reviewer ............................................................................. xxvi
Acknowledgments .............................................................................................. xxvii
Introduction ....................................................................................................... xxviii
Part 1: Introducing .NET ...........................................................................................1
■ Chapter 1: The .NET Framework ..........................................................................3
The Evolution of Web Development .................................................................................3
HTML and HTML Forms ..........................................................................................................................3
Server-Side Programming ......................................................................................................................6
Client-Side Programming .......................................................................................................................7

The .NET Framework .......................................................................................................9
C#, VB, and the .NET Languages ..........................................................................................................11
The Common Language Runtime .........................................................................................................13
The .NET Class Library..........................................................................................................................14
Visual Studio.........................................................................................................................................15

The Last Word................................................................................................................16
■ Chapter 2: The C# Language ..............................................................................17
The .NET Languages ......................................................................................................17
C# Language Basics ......................................................................................................18
Case Sensitivity ....................................................................................................................................18
Commenting .........................................................................................................................................18
Statement Termination.........................................................................................................................19

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Blocks...................................................................................................................................................20

Variables and Data Types ..............................................................................................20
Assignment and Initializers ..................................................................................................................22
Strings and Escaped Characters ..........................................................................................................24
Arrays ...................................................................................................................................................24
Enumerations .......................................................................................................................................26

Variable Operations .......................................................................................................27
Advanced Math.....................................................................................................................................29
Type Conversions .................................................................................................................................29

Object-Based Manipulation ...........................................................................................31
The String Type ....................................................................................................................................32
The DateTime and TimeSpan Types .....................................................................................................34
The Array Type......................................................................................................................................36

Conditional Logic ...........................................................................................................37
The if Statement ...................................................................................................................................38
The switch Statement...........................................................................................................................39

Loops .............................................................................................................................40
The for Loop..........................................................................................................................................40
The foreach Loop..................................................................................................................................41
The while loop ......................................................................................................................................42

Methods.........................................................................................................................43
Parameters ...........................................................................................................................................44
Method Overloading .............................................................................................................................45
Optional and Named Parameters..........................................................................................................46
Delegates..............................................................................................................................................47

The Last Word................................................................................................................48
■ Chapter 3: Types, Objects, and Namespaces .....................................................49
The Basics About Classes..............................................................................................49
Static Members ....................................................................................................................................50
A Simple Class......................................................................................................................................51

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Building a Basic Class ...................................................................................................51
Creating an Object ................................................................................................................................53
Adding Properties .................................................................................................................................54
Automatic Properties ............................................................................................................................56
Adding a Method ..................................................................................................................................56
Adding a Constructor............................................................................................................................57
Adding an Event....................................................................................................................................59
Testing the Product Class.....................................................................................................................60

Value Types and Reference Types.................................................................................63
Assignment Operations ........................................................................................................................63
Equality Testing ....................................................................................................................................64
Passing Parameters by Reference and by Value ..................................................................................64
Reviewing .NET Types ..........................................................................................................................65

Understanding Namespaces and Assemblies................................................................67
Using Namespaces ...............................................................................................................................68
Importing Namespaces.........................................................................................................................69
Assemblies ...........................................................................................................................................70

Advanced Class Programming.......................................................................................71
Inheritance............................................................................................................................................71
Static Members ....................................................................................................................................73
Casting Objects.....................................................................................................................................74
Partial Classes ......................................................................................................................................76
Generics................................................................................................................................................77

The Last Word................................................................................................................79
Part 2: Developing ASP.NET Applications...............................................................81
■ Chapter 4: Visual Studio.....................................................................................83
The Promise of Visual Studio .........................................................................................83
Creating Websites..........................................................................................................84
Creating an Empty Web Application .....................................................................................................85

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Websites and Web Projects ..................................................................................................................89
The Hidden Solution Files .....................................................................................................................90
The Solution Explorer ...........................................................................................................................91
Adding Web Forms ...............................................................................................................................92
Migrating a Website from a Previous Version of Visual Studio.............................................................93

Designing a Web Page...................................................................................................95
Adding Web Controls ............................................................................................................................96
The Properties Window ........................................................................................................................98

The Anatomy of a Web Form .......................................................................................100
The Web Form Markup .......................................................................................................................100
The Page Directive..............................................................................................................................101
The Doctype........................................................................................................................................102
The Essentials of XHTML ....................................................................................................................104

Writing Code ................................................................................................................110
The Code-Behind Class ......................................................................................................................110
Adding Event Handlers .......................................................................................................................110
Outlining .............................................................................................................................................112
IntelliSense .........................................................................................................................................113
Code Formatting and Coloring ............................................................................................................117

Visual Studio Debugging..............................................................................................118
The Visual Studio Web Server ............................................................................................................118
Single-Step Debugging.......................................................................................................................119
Variable Watches................................................................................................................................124

The Last Word..............................................................................................................125
■ Chapter 5: Web Form Fundamentals................................................................127
The Anatomy of an ASP.NET Application .....................................................................127
ASP.NET File Types.............................................................................................................................128
ASP.NET Application Directories.........................................................................................................129

Introducing Server Controls .........................................................................................130
HTML Server Controls.........................................................................................................................131

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Converting an HTML Page to an ASP.NET Page..................................................................................131
View State ..........................................................................................................................................134
The HTML Control Classes..................................................................................................................135
Adding the Currency Converter Code .................................................................................................138
Event Handling....................................................................................................................................140
Behind the Scenes with the Currency Converter................................................................................142
Error Handling.....................................................................................................................................144

Improving the Currency Converter...............................................................................144
Adding Multiple Currencies ................................................................................................................145
Storing Information in the List ............................................................................................................146
Adding Linked Images ........................................................................................................................147
Setting Styles .....................................................................................................................................150

A Deeper Look at HTML Control Classes......................................................................151
HTML Control Events ..........................................................................................................................151
Advanced Events with the HtmlInputImage Control ...........................................................................152
The HtmlControl Base Class ...............................................................................................................154
The HtmlContainerControl Class.........................................................................................................155
The HtmlInputControl Class ................................................................................................................155

The Page Class ............................................................................................................156
Sending the User to a New Page ........................................................................................................157
HTML Encoding...................................................................................................................................158

Application Events .......................................................................................................160
The global.asax File............................................................................................................................161
Additional Application Events .............................................................................................................162

ASP.NET Configuration ................................................................................................163
The web.config File ............................................................................................................................163
Nested Configuration ..........................................................................................................................164
Storing Custom Settings in the web.config File .................................................................................166
The Website Administration Tool (WAT) .............................................................................................168

The Last Word..............................................................................................................170

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■ Chapter 6: Web Controls ..................................................................................173
Stepping Up to Web Controls . .....................................................................................173
Basic Web Control Classes . .................................................................................................................174
The Web Control Tags...........................................................................................................................175

Web Control Classes . ..................................................................................................176
The WebControl Base Class..................................................................................................................177
Units . ....................................................................................................................................................179
Enumerations .......................................................................................................................................179
Colors . ..................................................................................................................................................180
Fonts. ....................................................................................................................................................181
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Focus . ...................................................................................................................................................183
The Default Button................................................................................................................................183

List Controls. ...............................................................................................................184
Multiple-Select List Controls . ..............................................................................................................185
The BulletedList Control .......................................................................................................................187

Table Controls. ............................................................................................................188
Web Control Events and AutoPostBack . .....................................................................193
How Postback Events Work. ................................................................................................................197
The Page Life Cycle ..............................................................................................................................198

A Simple Web Page. ....................................................................................................201
Improving the Greeting Card Generator. ..............................................................................................206
Generating the Cards Automatically . ...................................................................................................208

The Last Word. ............................................................................................................211
■ Chapter 7: Error Handling, Logging, and Tracing.............................................213
Common Errors. ..........................................................................................................213
Exception Handling . ....................................................................................................215
The Exception Class .............................................................................................................................215
The Exception Chain .............................................................................................................................217

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Handling Exceptions ....................................................................................................218
Catching Specific Exceptions .............................................................................................................219
Nested Exception Handlers.................................................................................................................221
Exception Handling in Action..............................................................................................................222
Mastering Exceptions .........................................................................................................................224

Throwing Your Own Exceptions ...................................................................................224
Logging Exceptions......................................................................................................229
Viewing the Windows Event Logs.......................................................................................................229
Writing to the Event Log .....................................................................................................................232
Custom Logs.......................................................................................................................................234
A Custom Logging Class .....................................................................................................................236
Retrieving Log Information .................................................................................................................237

Page Tracing................................................................................................................239
Enabling Tracing.................................................................................................................................240
Tracing Information ............................................................................................................................240
Writing Trace Information...................................................................................................................246
Application-Level Tracing...................................................................................................................250

The Last Word..............................................................................................................252
■ Chapter 8: State Management .........................................................................253
The Problem of State ...................................................................................................253
View State....................................................................................................................253
The ViewState Collection....................................................................................................................254
A View State Example.........................................................................................................................254
Making View State Secure .................................................................................................................255
Retaining Member Variables ..............................................................................................................257
Storing Custom Objects ......................................................................................................................259

Transferring Information Between Pages ....................................................................260
Cross-Page Posting ............................................................................................................................260
The Query String.................................................................................................................................265

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Cookies ........................................................................................................................269
A Cookie Example ...............................................................................................................................271

Session State...............................................................................................................272
Session Tracking ................................................................................................................................272
Using Session State............................................................................................................................273
A Session State Example....................................................................................................................274

Session State Configuration ........................................................................................277
Cookieless ..........................................................................................................................................278
Timeout...............................................................................................................................................281
Mode...................................................................................................................................................281

Application State..........................................................................................................286
An Overview of State Management Choices................................................................288
The Last Word..............................................................................................................290
Part 3: Building Better Web Forms .......................................................................291
■ Chapter 9: Validation .......................................................................................293
Understanding Validation.............................................................................................293
The Validation Controls.......................................................................................................................294
Server-Side Validation........................................................................................................................295
Client-Side Validation .........................................................................................................................295

The Validation Controls................................................................................................295
A Simple Validation Example ..............................................................................................................297
Other Display Options .........................................................................................................................299
Manual Validation ...............................................................................................................................302
Validating with Regular Expressions ..................................................................................................304
A Validated Customer Form ................................................................................................................308
Validation Groups................................................................................................................................313

The Last Word..............................................................................................................314

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■ Chapter 10: Rich Controls ................................................................................315
The Calendar................................................................................................................315
Formatting the Calendar.....................................................................................................................317
Restricting Dates ................................................................................................................................319

The AdRotator ..............................................................................................................323
The Advertisement File.......................................................................................................................323
The AdRotator Class ...........................................................................................................................325

Pages with Multiple Views...........................................................................................326
The MultiView Control ........................................................................................................................328
The Wizard Control .............................................................................................................................333

The Last Word..............................................................................................................341
■ Chapter 11: User Controls and Graphics ..........................................................343
User Controls ...............................................................................................................343
Creating a Simple User Control ..........................................................................................................344
Independent User Controls .................................................................................................................347
Integrated User Controls.....................................................................................................................349
User Control Events ............................................................................................................................352
Passing Information with Events ........................................................................................................354

Dynamic Graphics........................................................................................................357
Basic Drawing ....................................................................................................................................357
Drawing a Custom Image ...................................................................................................................360
Placing Custom Images Inside Web Pages.........................................................................................361
Image Format and Quality ..................................................................................................................363

The Last Word..............................................................................................................366
■ Chapter 12: Styles, Themes, and Master Pages...............................................367
Styles ...........................................................................................................................367
Style Types .........................................................................................................................................368
Creating a Basic Inline Style...............................................................................................................368
Creating a Style Sheet ........................................................................................................................377

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Applying Style Sheet Rules.................................................................................................................380

Themes ........................................................................................................................383
How Themes Work .............................................................................................................................383
Applying a Simple Theme...................................................................................................................385
Handling Theme Conflicts...................................................................................................................386
Creating Multiple Skins for the Same Control ....................................................................................388
More Advanced Skins.........................................................................................................................389

Master Page Basics .....................................................................................................391
A Simple Master Page and Content Page ...........................................................................................392
How Master Pages and Content Pages Are Connected ......................................................................396
A Master Page with Multiple Content Regions ...................................................................................398
Default Content...................................................................................................................................401
Master Pages and Relative Paths .......................................................................................................402

Advanced Master Pages ..............................................................................................403
Style-Based Layouts...........................................................................................................................403
Code in a Master Page........................................................................................................................408
Interacting with a Master Page Programmatically .............................................................................409

The Last Word..............................................................................................................410
■ Chapter 13: Website Navigation.......................................................................411
Site Maps.....................................................................................................................411
Defining a Site Map ............................................................................................................................412
Seeing a Simple Site Map in Action....................................................................................................416
Binding an Ordinary Page to a Site Map.............................................................................................416
Binding a Master Page to a Site Map .................................................................................................418
Binding Portions of a Site Map ...........................................................................................................420
The SiteMap Class ..............................................................................................................................425

URL Mapping and Routing ...........................................................................................427
URL Mapping ......................................................................................................................................428
URL Routing ........................................................................................................................................428

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The SiteMapPath Control .............................................................................................430
Customizing the SiteMapPath ............................................................................................................431
Using SiteMapPath Styles and Templates ..........................................................................................432
Adding Custom Site Map Information.................................................................................................434

The TreeView Control...................................................................................................435
TreeView Properties ...........................................................................................................................436
TreeView Styles ..................................................................................................................................438

The Menu Control ........................................................................................................442
Menu Styles........................................................................................................................................444
Menu Templates .................................................................................................................................445

The Last Word..............................................................................................................448
Part 4: Working with Data ....................................................................................449
■ Chapter 14: ADO.NET Fundamentals ................................................................451
Understanding Databases............................................................................................451
Configuring Your Database ..........................................................................................453
SQL Server Express ............................................................................................................................453
Browsing and Modifying Databases in Visual Studio .........................................................................454
The sqlcmd Command-Line Tool ........................................................................................................457

SQL Basics...................................................................................................................458
Running Queries in Visual Studio .......................................................................................................459
The Select Statement .........................................................................................................................461
The SQL Update Statement.................................................................................................................463
The SQL Insert Statement...................................................................................................................465
The SQL Delete Statement..................................................................................................................465

The Data Provider Model .............................................................................................466
Direct Data Access ......................................................................................................467
Creating a Connection ........................................................................................................................469
The Select Command .........................................................................................................................475
The DataReader ..................................................................................................................................476

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Putting It All Together.........................................................................................................................476
Updating Data .....................................................................................................................................481

Disconnected Data Access ..........................................................................................491
Selecting Disconnected Data..............................................................................................................492
Selecting Multiple Tables ...................................................................................................................494
Defining Relationships........................................................................................................................495

The Last Word..............................................................................................................498
■ Chapter 15: Data Binding .................................................................................499
Introducing Data Binding .............................................................................................499
Types of ASP.NET Data Binding..........................................................................................................500
How Data Binding Works ....................................................................................................................500

Single-Value Data Binding ...........................................................................................500
A Simple Data Binding Example .........................................................................................................501
Simple Data Binding with Properties..................................................................................................504
Problems with Single-Value Data Binding..........................................................................................505
Using Code Instead of Simple Data Binding .......................................................................................506

Repeated-Value Data Binding......................................................................................506
Data Binding with Simple List Controls ..............................................................................................507
A Simple List Binding Example...........................................................................................................508
Strongly Typed Collections .................................................................................................................509
Multiple Binding..................................................................................................................................510
Data Binding with a Dictionary Collection ..........................................................................................512
Using the DataValueField Property .....................................................................................................513
Data Binding with ADO.NET ................................................................................................................514
Creating a Record Editor.....................................................................................................................516

Data Source Controls ...................................................................................................521
The Page Life Cycle with Data Binding...............................................................................................523
The SqlDataSource .............................................................................................................................523
Selecting Records...............................................................................................................................525
Parameterized Commands .................................................................................................................527

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Handling Errors...................................................................................................................................532
Updating Records ...............................................................................................................................533

The Last Word..............................................................................................................537
■ Chapter 16: The Data Controls .........................................................................539
The GridView................................................................................................................539
Automatically Generating Columns ....................................................................................................540
Defining Columns ...............................................................................................................................542

Formatting the GridView ..............................................................................................546
Formatting Fields................................................................................................................................546
Using Styles........................................................................................................................................547
Formatting-Specific Values ................................................................................................................550

Selecting a GridView Row............................................................................................552
Adding a Select Button .......................................................................................................................553
Using Selection to Create Master-Details Pages ................................................................................554

Editing with the GridView ............................................................................................556
Sorting and Paging the GridView .................................................................................559
Sorting ................................................................................................................................................559
Paging.................................................................................................................................................561

Using GridView Templates...........................................................................................563
Using Multiple Templates ...................................................................................................................565
Editing Templates in Visual Studio .....................................................................................................566
Handling Events in a Template ...........................................................................................................567
Editing with a Template......................................................................................................................568

The DetailsView and FormView ...................................................................................573
The DetailsView ..................................................................................................................................573
The FormView.....................................................................................................................................575

The Last Word..............................................................................................................578
■ Chapter 17: Files and Streams.........................................................................579
Files and Web Applications..........................................................................................579

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File System Information...............................................................................................580
The Path Class ....................................................................................................................................581
The Directory and File Classes ...........................................................................................................582
The DirectoryInfo and FileInfo Classes ...............................................................................................587
The DriveInfo Class.............................................................................................................................589
A Sample File Browser .......................................................................................................................590

Reading and Writing with Streams ..............................................................................594
Text Files ............................................................................................................................................594
Binary Files.........................................................................................................................................596
Shortcuts for Reading and Writing Files.............................................................................................597
A Simple Guest Book ..........................................................................................................................598

Allowing File Uploads ..................................................................................................604
The FileUpload Control .......................................................................................................................604

The Last Word..............................................................................................................607
■ Chapter 18: XML...............................................................................................609
XML Explained .............................................................................................................609
Improving the List with XML...............................................................................................................611
XML Basics .........................................................................................................................................612
Attributes ............................................................................................................................................613
Comments ..........................................................................................................................................614

The XML Classes..........................................................................................................615
The XML TextWriter ............................................................................................................................615
The XML Text Reader..........................................................................................................................618
Working with XML Documents in Memory .........................................................................................623
Reading an XML Document ................................................................................................................628
Searching an XML Document .............................................................................................................631

XML Validation .............................................................................................................632
XML Namespaces ...............................................................................................................................632
XML Schema Definition ......................................................................................................................635
Validating an XML Document..............................................................................................................637

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XML Display and Transforms .......................................................................................640
The Xml Web Control ..........................................................................................................................642

The Last Word..............................................................................................................643
Part 5: Website Security .......................................................................................645
■ Chapter 19: Security Fundamentals.................................................................647
Understanding Security ...............................................................................................647
Testing and Deploying Security Settings............................................................................................648

Authentication and Authorization ................................................................................649
Forms Authentication ..................................................................................................649
Web.config Settings ...........................................................................................................................651
Authorization Rules ............................................................................................................................651
The WAT .............................................................................................................................................655
The Login Page ...................................................................................................................................657

Windows Authentication ..............................................................................................663
Web.config Settings ...........................................................................................................................663
A Windows Authentication Test..........................................................................................................666

The Last Word..............................................................................................................667
■ Chapter 20: Membership..................................................................................669
The Membership Data Store ........................................................................................669
Membership with SQL Server Express ...............................................................................................671
Using the Full Version of SQL Server ..................................................................................................673
Configuring the Membership Provider................................................................................................676
Creating Users with the WAT..............................................................................................................679
The Membership and MembershipUser Classes ................................................................................682
Authentication with Membership .......................................................................................................686
Disabled Accounts ..............................................................................................................................687

The Security Controls ..................................................................................................687
The Login Control................................................................................................................................688
The CreateUserWizard Control............................................................................................................694

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The PasswordRecovery Control. ..........................................................................................................698

Role-Based Security . ..................................................................................................700
Creating and Assigning Roles. .............................................................................................................701
Restricting Access Based on Roles . ....................................................................................................705
The LoginView Control..........................................................................................................................705

The Last Word. ............................................................................................................707
■ Chapter 21: Profiles .........................................................................................709
Understanding Profiles . ..............................................................................................709
Profile Performance..............................................................................................................................710
How Profiles Store Data........................................................................................................................710
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Using the SqlProfileProvider . ......................................................................................712
Enabling Authentication........................................................................................................................712
Using SQL Server Express ....................................................................................................................713
Using the Full Version of SQL Server . ..................................................................................................713
The Profile Databases...........................................................................................................................714
Defining Profile Properties....................................................................................................................716
Using Profile Properties ........................................................................................................................717
Profile Serialization ..............................................................................................................................719
Profile Groups .......................................................................................................................................721
Profiles and Custom Data Types. .........................................................................................................722
The Profile API ......................................................................................................................................725
Anonymous Profiles..............................................................................................................................728

The Last Word. ............................................................................................................731
Part 6: Advanced ASP.NET....................................................................................733
■ Chapter 22: Introducing ASP.NET.....................................................................735
Why Use Components? . ..............................................................................................735
Component Jargon . ....................................................................................................736
Three-Tier Design .................................................................................................................................736
Encapsulation .......................................................................................................................................738

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Business Objects ................................................................................................................................738
Data Objects .......................................................................................................................................738
Components and Classes ...................................................................................................................738

Creating a Component .................................................................................................739
Classes and Namespaces...................................................................................................................740
Class Members ...................................................................................................................................742
Adding a Reference to the Component...............................................................................................742
Using the Component .........................................................................................................................745

Properties and State ....................................................................................................747
A Stateful Account Class ....................................................................................................................748
A Stateless AccountUtility Class .........................................................................................................749

Data-Access Components............................................................................................750
A Simple Data-Access Component .....................................................................................................750
Using the Data-Access Component ....................................................................................................754
Enhancing the Component with Error Handling..................................................................................757
Enhancing the Component with Aggregate Information.....................................................................758

The ObjectDataSource .................................................................................................759
Making Classes the ObjectDataSource Can Understand ....................................................................759
Selecting Records...............................................................................................................................760
Using Method Parameters ..................................................................................................................761
Updating Records ...............................................................................................................................762

The Last Word..............................................................................................................764
■ Chapter 23: Caching.........................................................................................765
Understanding Caching ...............................................................................................765
When to Use Caching..........................................................................................................................766
Caching in ASP.NET ............................................................................................................................767

Output Caching ............................................................................................................767
Caching on the Client Side .................................................................................................................769
Caching and the Query String.............................................................................................................769
Caching with Specific Query String Parameters.................................................................................770

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■ CONTENTS

A Multiple Caching Example ...............................................................................................................771
Fragment Caching ..............................................................................................................................772
Cache Profiles.....................................................................................................................................773

Data Caching ...............................................................................................................774
Adding Items to the Cache .................................................................................................................774
A Simple Cache Test...........................................................................................................................776
Caching to Provide Multiple Views .....................................................................................................777
Caching with the Data Source Controls..............................................................................................781

Caching with Dependencies ........................................................................................785
File Dependencies ..............................................................................................................................785
Cache Item Dependencies ..................................................................................................................786
SQL Server Cache Dependencies .......................................................................................................787

The Last Word..............................................................................................................790
■ Chapter 24: LINQ and the Entity Framework....................................................791
Understanding LINQ.....................................................................................................791
LINQ Basics..................................................................................................................792
LINQ Expressions................................................................................................................................795

The Entity Framework..................................................................................................799
Creating an Entity Data Model ............................................................................................................800
The Data Model Diagram ....................................................................................................................803
Updating a Data Model .......................................................................................................................806
The Data Model Code .........................................................................................................................808
Querying the Data Model ....................................................................................................................809
Handling Errors...................................................................................................................................810
Navigating Relationships ....................................................................................................................812

Getting More Advanced with the Entity Framework ....................................................815
Querying with LINQ to Entities............................................................................................................815
Controlling When Data is Loaded........................................................................................................818
Updates, Inserts, and Deletes.............................................................................................................820
Managing Concurrency.......................................................................................................................822

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■ CONTENTS

The EntityDataSource ..................................................................................................823
Displaying Data...................................................................................................................................823
Editing Data ........................................................................................................................................828

The Last Word..............................................................................................................828
■ Chapter 25: ASP.NET AJAX...............................................................................829
Understanding Ajax......................................................................................................829
Ajax: The Good....................................................................................................................................830
Ajax: The Bad......................................................................................................................................830
The ASP.NET AJAX Toolkit ..................................................................................................................831
The ScriptManager .............................................................................................................................831

Partial Refreshes .........................................................................................................833
A Simple UpdatePanel Test ................................................................................................................834
Handling Errors...................................................................................................................................837
Conditional Updates............................................................................................................................839
Triggers ..............................................................................................................................................840

Progress Notification ...................................................................................................845
Showing a Simulated Progress Bar ....................................................................................................845
Cancellation........................................................................................................................................847

Timed Refreshes..........................................................................................................849
The ASP.NET AJAX Control Toolkit...............................................................................851
Installing the ASP.NET AJAX Control Toolkit.......................................................................................851
The Accordion.....................................................................................................................................853
The AutoCompleteExtender ................................................................................................................856
Getting More Controls.........................................................................................................................859

The Last Word..............................................................................................................864
■ Chapter 26: Deploying ASP.NET Applications ..................................................865
ASP.NET Applications and the Web Server..................................................................865
How Web Servers Work ......................................................................................................................865
The Virtual Directory...........................................................................................................................867

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