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What is an UpdatePanel Control?

  •  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.

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