export to excel in grid - simplest way

   Response.Clear();

        Response.Buffer = true;

        Response.ClearContent();

        Response.ClearHeaders();

        Response.Charset = "";

        string FileName = "Vithal" + DateTime.Now + ".xls";

        StringWriter strwritter = new StringWriter();

        HtmlTextWriter htmltextwrtter = new HtmlTextWriter(strwritter);

        Response.Cache.SetCacheability(HttpCacheability.NoCache);

        Response.ContentType = "application/vnd.ms-excel";

        Response.AddHeader("Content-Disposition", "attachment;filename=" + FileName);

        GridView1.GridLines = GridLines.Both;

        GridView1.HeaderStyle.Font.Bold = true;

        GridView1.RenderControl(htmltextwrtter);

        Response.Write(strwritter.ToString());

        Response.End();