Export GridView to Excel in ASP.NET

Here is the same code to export GridView from C# in ASP.NET

protected void ExportButton_Click(object sender, EventArgs e)
{
   Response.AddHeader("content-disposition", "attachment;filename=Contacts.xls");
   Response.Charset = String.Empty;
   Response.ContentType = "application/vnd.xls";
   System.IO.StringWriter sw = new System.IO.StringWriter();
   System.Web.UI.HtmlTextWriter hw = new HtmlTextWriter(sw);
   ContactsGridView.RenderControl(hw);
   Response.Write(sw.ToString());
   Response.End();
 }

Hope this is useful