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to carefully tweak exactly which parts of your page you ll want to have updated when you do a partial page refresh. With these and many more potential scenarios in mind, ASP.NET AJAX has been designed to provide controls, script libraries, and technology support to make building RIA applications as easy for the developer as possible. The functionality of ASP .NET AJAX has been broken down into two paradigms: server, containing the suite of ASP .NET controls to handle things such as partial refreshes, update progress, timers, and server-side integration with other applications across web services or other communications profiles; and client, which contains JavaScript classes to support value-added functionality, such as a browser-independent layer, extensions to support object orientation, and more. You can see the basic ASP .NET AJAX server and client architectures in Figure 12-1.

The value() method accepts an XQuery expression and returns a scalar (single) value. Listing 10-34 shows the use of this method. Listing 10-34. Using the value() Method SELECT xmldata.value('(/Employee/@EmployeeID)[1]','int') FROM xmldocs WHERE id=1 ----------1

The user s business telephone details:

user.business-info.telecom.telephone.intcode user.business-info.telecom.telephone.loccode user.business-info.telecom.telephone.number user.business-info.telecom.telephone.ext user.business-info.telecom.telephone.comment

The ASP .NET infrastructure provides many application services to server applications, including components that manage the UI and flow of an application (see Part 1 of this book for more details), handling serialization, validation, and extensibility, among other things. ASP.NET 2.0 also supports services such as database-backed user profiles and security and authentication methodologies. When using ASP.NET AJAX extensions, the whole ASP .NET framework is available for you to use, providing many value-added services, saving you time and effort in development. ASP .NET also supports and provides web services that can be called from a client script that can work with the resources that ASP.NET provides. For example, you can use client scripts to help protect resources through forms authentication, or you can access user profiles, allowing user-specific settings to be stored on the server.

The value() method accepts two parameters: The first parameter is an XQuery. The second parameter is the target SQL Server data type. In our example, we are trying to select the EmployeeID attribute value of the first employee. Note that the expression /Employee/@EmployeeID returns multiple rows, and hence we specify the row index to access by using array notation. The EmployeeID scalar value is to be represented as an integer, and hence the second parameter is int. Note that the data type name must be enclosed in quotes.

11

The major new additions to the server architecture are the ASPNET AJAX server controls There are a number of these, and they will be discussed in detail in 13 The major ones that you ll use in just about every application are the following: ScriptManager: This component is used to manage the scripts that will be downloaded to the client There are a number of client script libraries available to ASPNET developers, and when a ScriptManager is used, only the relevant ones are downloaded to the client You ll need to use a ScriptManager in just about every Ajax application UpdatePanel: This is used to visually design the part of the page that is used in a partial page update Simply put, when you wrap an area of your page in an UpdatePanel, it will be automatically enabled for partial refreshes using Ajax.

The user s business fax details:

The exist() method checks whether there are any nodes matching the supplied XQuery expression. Listing 10-35 illustrates the use of the exist() method. Listing 10-35. Using the exist() Method SELECT xmldata.exist('/Employee[@EmployeeID=1]') FROM xmldocs The exist() method returns 1 if the XQuery expression returns at least one node, 0 if the XQuery expression returns zero nodes, and NULL if the XML column is null.

user.business-info.telecom.fax.intcode user.business-info.telecom.fax.loccode user.business-info.telecom.fax.number user.business-info.telecom.fax.ext user.business-info.telecom.fax.comment

UpdateProgress: This provides status information for the progress of the download occurring in the UpdatePanel Timer: The Timer performs postbacks at defined intervals It can be used to trigger automatic updates (and therefore partial refreshes) to an area of the page that is wrapped with an UpdatePanel Despite being extensions to a server-side technology, the ASPNET AJAX extensions also provide an abundance of client-side functionality, including the following: Browser compatibility layer: If you look back to the Ajax examples in the previous chapter, you ll notice that at the Ajax declaration there are if..then scripts that handle instantiation of the XMLHttpRequest object on different browsers The browser compatibility layer is designed to abstract this process if you code to the AJAX extensions JavaScript libraries, you do not need to worry about the underlying technologies that the browser supports.

XML Data Modification Language (XML DML)

The user s business mobile phone details: