protected void btnOKExport_Click(object sender, EventArgs e) {


string filename = HttpUtility.UrlEncode(this.txtFileNameExport.Text);

filename = filename.Replace("+", "%20");

this.eExporter.DownloadName = filename;

this.eExporter.DataExportMode = (DataExportMode)Enum.Parse(typeof(DataExportMode), this.rdoExportTypeExport.SelectedValue);


this.eExporter.WorkbookFormat = (Infragistics.Excel.WorkbookFormat)Enum.Parse(typeof(Infragistics.Excel.WorkbookFormat), "Excel97To2003");


bool singleGridPerSheet = false;


this.eExporter.Export(singleGridPerSheet, this.webDGExport);

} I want to hide the modalpopup extender after the above button click event which is not happening. Please help.