25.2. Partial Refreshes
The key technique in an Ajax web application is partial refreshes. With partial refreshes, the entire page doesn't need to be posted back and refreshed in the browser. Instead, when something happens the web page asks the web server for more information. The request takes place in the background, so the web page remains responsive. (It's up to you whether you use some sort of progress indicator if you think the request might take a noticeable amount of time.) When the web page receives the response, it updates just the changed portion of the page, as shown in Figure 25-1.
Figure 25.1. Ordinary server-side pages versus Ajax
ASP.NET includes a handy control that lets you take an ordinary page with server-side logic and ...
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