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AJAX is an exciting Web platform for many reasons. Using AJAX, many tasks that were traditionally performed on the server happen in the browser instead, resulting in fewer round-trips to the server, lower bandwidth consumption, and faster, more responsive Web UIs. While these outcomes are the result of offloading a good deal of work to the client, the browser still isn't the environment of choice for many developers who would rather have the full power and flexibility of server apps at their disposal.
The solution employed until now has involved the UpdatePanel control, which has allowed developers to build AJAX applications while still retaining the full array of server tools. But UpdatePanel carries a lot of weight from the traditional postback model-an UpdatePanel request is still a full postback. In fact, using Update­Panel, the whole form (including ViewState) is posted to the server, almost the entire page lifecycle gets executed there, and the rendering still happens on the server. Obviously, this method defeats one of the main reasons for moving to AJAX. The only real savings here are that XmlHttpRequest is used instead of a regular HTTP POST request and only updated parts of the page and the ViewState are sent back to the client. Thus, the response is much smaller, but the request isn't.
A pure AJAX approach will almost always perform better than the UpdatePanel approach. In a purely AJAX solution, the rendering happens on the client and the server sends back only data, which is usually much smaller than the equivalent HTML. This approach can also substantially reduce the number of network requests: having the data on the client allows much of the application's UI logic to run in the browser.



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