สอบถามเกี่ยวกับ Excel Gen เป็น Format หน่อยอะครับแบบ Content Templete

protected void Export_Click(object sender, EventArgs e)
        {
            if (gvOrg.Rows.Count > 0)
            {
                genExcel();
                
            }
        }

 private void genExcel()
        {
            System.IO.StringWriter tw = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
            DataGrid dgGrid = new DataGrid();

            dgGrid.DataSource = ViewState["report"];
            dgGrid.DataBind();
            //Get the HTML for the control.
            dgGrid.RenderControl(hw);
            Response.AddHeader("content-disposition", "attachment;filename=export_user_status.xls");
            Response.ContentType = "application/vnd.ms-excel";
            this.EnableViewState = false;
            string head = "<meta http-equiv='Conten-type' content ='text/html; charset=utf-8'>";
            Response.Write(head + tw.ToString());
            Response.End();

        }