Server cannot append header after HTTP headers
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Hi All, In my Webpage i have a Button control. On the button Click i have following functionalities **1.**To show the "progress bar" Icon during retrieving data from Sqlserver Database.. **2.**After retrieving a Data from DB a csv report will be generated. For Point 1--the below is the code i have used Code snippet for busy Icon: ============================ Response.Write("<div ID='mydiv' STYLE='position:absolute;z-index:5000;top:0;left:0;width:100%;height:100%;'><table cellspacing='0' cellpadding='0' border='0' align='center'><tr><td class='copy' align='right' height='260'><img src='./processingimage.gif' width='0' align='absmiddle'></td></tr><tr><td class='copyblack' style='font-family:arial;font-size:14px' align='center'><img src='./processingimage.gif' border='0' align='absmiddle'><br><br>" + strBusyMessage + "<br>" + strReportCreteria + "</td></tr></table>") Response.Write(" ") Response.Write("</div>") Response.Write("<script> var mydiv = document.getElementById('mydiv');</script>") Response.Write("<script language=javascript>") Response.Write("function StartShowWait(){mydiv.style.visibility ='visible';}") Response.Write("function HideWait(){mydiv.style.visibility = 'hidden';}") Response.Write("StartShowWait();</script>") 'Page.Session.Add("SessionID", Session.SessionID) Response.Flush() ================================= For point 2: please see the below code snippet Code snippet to generate CSV report. ================================================== Response.AddHeader("Content-Disposition", "attachment; filename=" + CSVName) Response.ContentType = "application/csv" Response.Write(CSVContent) Response.Flush() Response.Close() ===================================================== when coming to above mention code line(bold one in above snippet) i am getting the below error "Server cannot append header after HTTP headers have been sent" Please help me in resolving the above error.