Export to excel

Code:

 protected void ExportToExcel(object sender, EventArgs e)
    {


        System.IO.StringWriter stringWrite = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
        Response.AddHeader("content-disposition", "attachment;filename=" + "export.xls");
        Response.ContentType = "application/vnd.xls";
        GridViewTimingPart.RenderControl(htmlWrite);
        Response.Write(stringWrite.ToString());
        Response.End();

    }

Si Masterpage

protected void ImageButtonExportExcel_Click(object sender, ImageClickEventArgs e)
{
System.IO.StringWriter stringWrite = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
Response.AddHeader("content-disposition", "attachment;filename=" + "export.xls");
Response.ContentType = "application/vnd.xls";
HtmlForm frm = new HtmlForm();
this.Controls.Add(frm);
frm.Controls.Add(tableData);
frm.RenderControl(htmlWrite);
Response.Write(stringWrite.ToString());
Response.End();

}