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.
To let the user know that the network conversation is taking place, the ASP.NET AJAX UpdateProgress control provides immediate feedback by displaying an animated image, ‘loading’ text, or other HTML that disappears once the network response is received.
For more details on how to apply them to the asp.net application, please reference at: http://www.codegod.de/webappcodegod/updatepanel-tutorial-aspnet-ajax-AID281.aspx
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