protected void btn_excel_Click(object sender, EventArgs e)
        {
            Response.Clear();

            Response.AddHeader("content-disposition", "attachment;filename=SOPRODI_2_" + DateTime.Now.ToShortDateString() + ".xls");

            Response.Charset = "";

            // If you want the option to open the Excel file without saving than

            // comment out the line below

            Response.Cache.SetCacheability(HttpCacheability.NoCache);

            Response.ContentType = "application/vnd.xls";

            System.IO.StringWriter stringWrite = new System.IO.StringWriter();

            System.Web.UI.HtmlTextWriter htmlWrite =
                new HtmlTextWriter(stringWrite);

            R_Excel_2.RenderControl(htmlWrite);

            Response.Write(stringWrite.ToString());

            Response.End();
        }
        protected void LinkButton1_Click(object sender, EventArgs e)
        {
            Response.Clear();

            Response.AddHeader("content-disposition", "attachment;filename=SOPRODI_2_" + DateTime.Now.ToShortDateString() + ".xls");

            Response.Charset = "";

            Response.Cache.SetCacheability(HttpCacheability.NoCache);

            Response.ContentType = "application/vnd.xls";

            System.IO.StringWriter stringWrite = new System.IO.StringWriter();

            System.Web.UI.HtmlTextWriter htmlWrite =
                new HtmlTextWriter(stringWrite);

            R_Excel_2.RenderControl(htmlWrite);

            Response.Write(stringWrite.ToString());

            Response.End();
        }