Beginning Web Development, Silverlight, and ASP.NET AJAX

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300 CHAPTER 12 ■ AJAX EXTENSIONS FOR ASP.NET Using Ajax with Web Services Some other useful technologies that come with the ASP.NET AJAX extensions are the ability to develop a web service that provides a JavaScript proxy, and client-side libraries that allow you to reference and use this proxy directly from the browser. This is very useful for
CHAPTER 12 ■ AJAX EXTENSIONS FOR ASP.NET 301 developing mashup-style applications, where an interim server is not necessary to consume the web service and provide the data in HTML format, as is the typical design pattern when using web services. In this section, you’ll build a web service, make it accessible to JavaScript, and build a simple client that accesses it. For this example, you will build a web service that fronts the AdventureWorks database and uses its country code lookup table to allow you to convert a country code into a country name. For example, WS evaluates to Samoa and GL to Greenland. You can see this data in the Person.CountryRegion table. If you haven’t already set up an AdventureWorks database and connection to it in your application, it’s a good idea to work through Chapters 4 and 5 and the samples earlier in this chapter before continuing. You can still use this sample, but if you have connectivity trouble (i.e., reading the connection string from Web.config), go through those earlier samples and you should be fine. To get started, add a new ASMX web service to your solution and call it DataService. asmx. The full code for this service is listed following. This implements the simple web method GetCountryForRegion, taking in the region code and returning the country that matches it. using System; using System.Web; using System.Collections; using System.Web.Services; using System.Web.Services.Protocols; using System.Data; using System.Data.SqlClient; using System.Web.Configuration; [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class DataService : System.Web.Services.WebService { public DataService () { } //Uncomment the following line if using designed components //InitializeComponent(); [WebMethod] public string GetCountryForRegion(string strRegion) { string strReturn = "";
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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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350 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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Beginning Web Development, Silverlight, and ASP.NET AJAX

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