Revision: 45239
                            
                                                            
                                    
                                        
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                        at April 27, 2011 20:36 by kashif21
                            
                            Initial Code
//logic to identify your update panel Id if there are multiple update panels on your page.
 If scriptManager.AsyncPostBackSourceElementID.Equals(upUser.UniqueID) Or 
 //logic to identify your the control that generated this post back.
scriptManager.AsyncPostBackSourceElementID.Equals(cmdFilterUser.UniqueID) Or 
//if you want to identify a specific element exist in this panel like in my case there is gridview naming "ngvAuditHistory"
scriptManager.AsyncPostBackSourceElementID.Contains("ngvAuditHistory") 
Then
                        If Request.Params("__EVENTARGUMENT") = "0" Then
               //your logic for the __dopostback response
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a way to identify your specific update panel on the page on server side
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VB.NET