Beginning Web Development, Silverlight, and ASP.NET AJAX

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266 CHAPTER 11 ■ AJAX APPLICATIONS AND EMPOWERING THE WEB USER EXPERIENCE Figure 11-5. Using a mapping application Implementing forward caching using Ajax is pretty straightforward. This example will step you through how to do it by building a browser for the product photos in the AdventureWorks database. It will show one picture, and give you browse buttons that allow you to look at the next and previous pictures in the set. You’ll build a server page that pulls a picture based on a parameter from the AdventureWorks database, and tie the Ajax front end up to it. Building the Image Server The image server fronts the AdventureWorks database. If you don’t have it already installed on your machine, look back to Chapter 4 for a walk-through. The image server will be a simple web form application that takes in a parameter, queries the database for the image with the corresponding ID, and writes the image back to the response when it finds one. Unfortunately, AdventureWorks doesn’t have a contiguous set of images, so you’ll get a lot of broken links in your application. For example, there is an image corresponding to
CHAPTER 11 ■ AJAX APPLICATIONS AND EMPOWERING THE WEB USER EXPERIENCE 267 product ID 100, but none for product ID 101. To get around this, you would have to download a set of existing product IDs to the client and navigate through them—but for the sake of simplicity, this application just allows you to add and subtract 1 on the current ID, so you will end up with broken links in the final version. The first step is to add a new ASPX web form to your project. Call it GetPicture.aspx. In the Source view for the page, delete all the HTML markup, leaving only the top line, which contains the ASP.NET directives. When you are done, the source for your page should consist of just one line, and look like this: The next step is to add some code to the Page_Load event handler for this page. Make sure that the set of using includes everything that you’ll need for this operation. This includes the IO stuff to handle the streams, the Sql.DataClient to handle the database connection, and the imaging APIs to handle the graphics. Here’s the complete set: using System; using System.Data; using System.Configuration; using System.Collections; using System.Web.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.IO; using System.Drawing; using System.Drawing.Imaging; using System.Data.SqlClient; Now that you are ready to start coding, the first step will be to handle the input parameter. This page will be called using a URI like this: GetPicture.aspxPicID= , and the parameterized ID will be used to call the database for a specific picture. This is achieved with the following code: int picID; if (Request.Params["PicID"] != null) picID = Convert.ToInt16(Request.Params["PicID"]); else picID = 100;
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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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332 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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426 ■INDEX ■V V path language c
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Beginning Web Development, Silverlight, and ASP.NET AJAX

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