public void ExportReportCSV()
            {
                StringWriter sw = new StringWriter();
                sw.WriteLine(""Reference Number"");
                sw.WriteLine();
                Response.ClearContent();
                Response.AddHeader("content-disposition", "attachment;filename=Report" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".csv");
                Response.ContentType = "application/octet-stream";
                Response.BinaryWrite(Encoding.UTF8.GetPreamble());
                sw.WriteLine(string.Format(""{0}"", "12345SDCRG"));
                Response.Write(sw.ToString());
                Response.End();
            }