Beginning Web Development, Silverlight, and ASP.NET AJAX

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290 CHAPTER 12 ■ AJAX EXTENSIONS FOR ASP.NET } int c = a + b; lblAns.Text = c.ToString(); Now when you run the application, you’ll see something like Figure 12-8. When you type the numbers into the text fields, nothing happens until you click the button, which triggers a postback and a full refresh of the page. Depending on your system speed, you may or may not see a page blink, but you can notice the full page refresh by looking at the status bar. You can convert this to an Ajax application without changing any code. To do this, drag and drop a ScriptManager control from the Toolbox onto the page. (Look back to Figure 12-6 to see the Toolbox.) After doing this, drop an UpdatePanel on the page, and then find the Panel control in the standard Toolbox and add a panel inside the UpdatePanel. The Panel resolves to a at runtime, and can be resized within the Designer, causing the UpdatePanel to match it. See Figure 12-8 for an example. Figure 12-8. Updating an ASP.NET page to use Ajax
CHAPTER 12 ■ AJAX EXTENSIONS FOR ASP.NET 291 For the next step, you should drag and drop the text boxes, button, and label into the panel that you just added. Once you’ve done this, the source code of your page will look something like this: Untitled Page And that’s all you’ll need to do to get this application to become an Ajax one. Run the application, and you’ll see that when you run it, it no longer performs a full page refresh; it just does a partial Ajax-style one. You can see this in Figure 12-9.
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The EXPERT’s VOIce ® in .NET Beg
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Beginning Web Development, Silverli
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Contents About the Author . . . . .
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■CONTENTS ix ■CHAPTER 5 ASP.NET
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■CONTENTS xi ■CHAPTER 11 Ajax A
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■CONTENTS xiii ■CHAPTER 15 Enha
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About the Author ■LAURENCE MORONE
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Introduction This book is aimed at
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PART 1 Building Web Applications
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4 CHAPTER 1 ■ INTRODUCTION TO WEB
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10 CHAPTER 2 ■ BASICS OF WEB DEVE
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38 CHAPTER 3 ■ WEB FORMS WITH ASP
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CHAPTER 4 Data Binding with ASP.NET
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CHAPTER 4 ■ DATA BINDING WITH ASP
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106 CHAPTER 5 ■ ASP.NET WEB SERVI
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CHAPTER 6 Deploying Your Web Site I
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CHAPTER 6 ■ DEPLOYING YOUR WEB SI
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CHAPTER 7 .NET 3.0: Windows Communi
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CHAPTER 7 ■ .NET 3.0: WINDOWS COM
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CHAPTER 8 .NET 3.0: Windows Present
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CHAPTER 8 ■ .NET 3.0: WINDOWS PRE
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CHAPTER 9 .NET 3.0: Windows Workflo
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CHAPTER 9 ■ .NET 3.0: WINDOWS WOR
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234 CHAPTER 10 ■ .NET 3.0: PROGRA
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340 CHAPTER 14 ■ JAVASCRIPT PROGR
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CHAPTER 15 Enhancing the Web Experi
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CHAPTER 15 ■ ENHANCING THE WEB EX
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376 CHAPTER 16 ■ PROGRAMMING SILV
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416 ■INDEX applications. See also
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418 ■INDEX copying web sites, 25
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420 ■INDEX ■H H path language c
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422 ■INDEX object orientation, 16
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424 ■INDEX Sequential Workflow Co
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426 ■INDEX ■V V path language c
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