public void TestExcel()
        {
            //test exception
            var mLogExceptionHelper = MyFactory.GetExceptionLogHelper();

            mLogExceptionHelper.LogException(MethodBase.GetCurrentMethod(), new Exception("TEST...."), null);
            //test visitor
            var mLogVisitorHelper = MyFactory.GetLogVisitorHelper();
            var mVisitor          = new UserInfo();

            mVisitor.UserId   = "BBWANG";
            mVisitor.UserName = "******";
            mLogVisitorHelper.LogUser("Index", mVisitor);

            //test export
            var excelExportHelper = MyFactory.GetExportToExcelHelper();
            var tab = new DataTable();

            tab.Columns.Add(new DataColumn("A", typeof(string)));
            tab.Columns.Add(new DataColumn("B", typeof(string)));
            for (var i = 1; i <= 100; i++)
            {
                var row = tab.NewRow();
                row["A"] = string.Format("Row {0} Column{1}", i, 1);
                row["B"] = string.Format("Row {0} Column{1}", i, 2);
                tab.Rows.Add(row);
            }
            mCurrentController.ViewBag.DownloadLink = excelExportHelper.ExportToExcel("Test", "TEST-BEN", tab);
        }