Ajax Update panel in asp.net
Posted by Viral Sarvaiya on October 26, 2009
What ist the UpdatePanel in ASP.NET Ajax? The answer is easy: When adding an UpdatePanel-control to your page, you can achieve a partial-update of your page on a postback. Only the content in the UpdatePanel is refreshed, the other parts of the page remain unchanged. This topic explains, how you can setup an Ajax-enabled project and use the UpdatePanel control.
for more details click below….