protected override void ExportData()
        {
            using (var dlgSave = new SaveFileDialog())
            {
                dlgSave.Filter = "Microsoft Excel files (*.xlsx)|*.xlsx";
                dlgSave.Title  = "Export Data Grup Pelanggan";

                var result = dlgSave.ShowDialog();
                if (result == DialogResult.OK)
                {
                    using (new StCursor(Cursors.WaitCursor, new TimeSpan(0, 0, 0, 0)))
                    {
                        IImportExportDataBll <GrupCustomer> _importDataBll = new ImportExportDataGrupCustomerBll(dlgSave.FileName, _log);
                        _importDataBll.Export(_listOfCrupCustomer);
                    }
                }
            }
        }