private void bttPrint_Click(object sender, EventArgs e) { PrintDocuments.history_log PrintInvoice = new DXWindowsApplication2.PrintDocuments.history_log(); DateTime startDate = DateTime.Parse(dateEditStart.EditValue.ToString()); DateTime endDate = DateTime.Parse(dateEditEnd.EditValue.ToString()); DataTable loginfo = ((DataTable)gridControl2.DataSource); PrintInvoice.loopGenDataRow(loginfo, startDate, endDate); // PrintInvoice.ExportToPdf(pathname); PrintInvoice.ShowPreview(); }