Response.Clear();

            Response.Buffer = true;

            Response.ContentType = "application/ms-excel";
            Response.AddHeader("content-disposition", "attachment;filename=Hotel.xls");
            Response.Charset = "";

            System.IO.StringWriter swr = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter htw = new System.Web.UI.HtmlTextWriter(swr);


            GrigliaDati.RenderControl(htw);
            Response.Write(swr.ToString());
            Response.End();