Hi,

 i have remove warp and still i am unable to export to excel

Instead of xlExport use following code to export to Excel inside WARP .........And it will give you better performance also... Server Side: /// /// Exports the Excel /// public void btnExport1() { if (Page.Request.Params.Get("__EVENTTARGET") == "Button1") { Response.Clear(); Response.Buffer = true; Response.ContentType = "application/vnd.ms-excel"; Response.Charset = ""; this.EnableViewState = false; System.IO.StringWriter oStringWriter = new System.IO.StringWriter(); System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter); grdTaskPlanning.RenderControl(oHtmlTextWriter); Response.Write(oStringWriter.ToString()); Response.End(); } //xlExporter.Export(grdTaskPlanning); } Client Side: In java script method ; __doPostBack("Button1","1"); oEvent.needPostBack = false; return true;