Thanks

Hi

try this 


public override void VerifyRenderingInServerForm(Control control)

  {


// this is required for avoid error (control must be placed inside form tag)

  }

private void ExportGrid(string fileName, string contentType)

  {

  Response.Clear();

  Response.Buffer =


true;

  Response.AddHeader(


"content-disposition", "attachment;filename=" + fileName);

  Response.Charset =


"";

  Response.ContentType = contentType;


 


StringWriter sw = new StringWriter();

 


HtmlTextWriter HW = new HtmlTextWriter(sw);


 


// Read Style file (css) here and add to response

 


FileInfo fi = new FileInfo(Server.MapPath("~/css/StyleSheet.css"));

 


StringBuilder sb = new StringBuilder();

 


StreamReader sr = fi.OpenText();

 


while (sr.Peek() >= 0)

  {

  sb.Append(sr.ReadLine());

  }

  sr.Close();

  grdPaymentDeatils.RenderControl(HW);

  Response.Write(


"" + sw.ToString() + "");

  Response.Flush();

  Response.Close();

  Response.End();


  }

 

protected void btnExportExcel_Click(object sender, ImageClickEventArgs e)

  {

 
// Export Gridview to Excel

  ExportGrid(


DateTime.Now + "PaymentPaidDetails.xls", "application/vnd.ms-excel");

  }