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However, its server-side processing model has several drawbacks inherent in the technology: Enter Microsoft's ASP. AJAX, which stands for A synchronous J ava Script A nd X ML, is an integrated framework for providing incremental page updates via cross-platform Java Script, composed of server-side code comprising the Microsoft AJAX Framework, and a script component called the Microsoft AJAX Script Library. NET AJAX extensions also provide cross-platform support for accessing ASP. This whitepaper examines the partial page updates functionality of the ASP.
NET AJAX Extensions, which includes the Script Manager component, the Update Panel control, and the Update Progress control, and considers scenarios in which they should or should not be utilized.
This means that the Update Panel can work with the default data-bound controls (such as the Grid View), with user controls, and they can be programmed in script.
If you were to look at the rendered source of the page after clicking the button, it will confirm that in fact a post-back has not occurred - the original label text is still part of the source markup, and the label has changed through Java Script.To understand how the Update Panel works, so that you can best decide when its use is appropriate, you should examine the AJAX exchange.The following example uses an existing site and, Mozilla Firefox with the Firebug extension (Firebug captures XMLHttp Request data).Adding these controls to a page eliminates the need to refresh the whole page with each postback.Only the contents of the Update Panel control will be updated. NET AJAX controls require specific settings in a web.config file in order to function correctly.