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• An UpdatePanel control is a cover for server side controls which is to be partial postbacked on ajax enabled page. • All controls included in the UpdatePanel will be partial postbacked. Below is a small example of using an UpdatePanel. <asp:ScriptManager runat=''server''> </ asp:ScriptManager> <asp:UpdatePanel runat=''server''> <ContentTemplate> <asp:Button runat=''server''></asp:Button> </ContentTemplate> </asp:UpdatePanel> • On clicking the button the page will be updated partially. There won't be a full postback by the web page. • In this way the content beyond the update panel won't be posted back to the server. • The contents in the updatepanel will be refreshed only.