Beginning Web Development, Silverlight, and ASP.NET AJAX

CHAPTER 12 ■ AJAX EXTENSIONS FOR ASP.NET 295
Figure 12-13. Setting up the SQL query
When you click Next, you’ll be taken to the Define Parameters step (see Figure 12-14).
Here you can set up default parameter values that will be used in your SQL query. Select
QueryString as the parameter source, and the wizard will set up the code required to read
the parameter from the URI that you use to call the service. Give the query string field a
name (i.e., ZIP) and a default value. Now if you call your service using a URI like http://
server/pagename.aspxZIP=12345, the @PostalCode parameter will be loaded with 12345
prior to calling the database.