public static void C9Dtc_SaveExcel() { string sql = "select * from dtc"; accessdb = new AccessDbClass(MyMeans.strConn1); DataTable a = accessdb.SelectToDataTable(sql); DataTable dt = a; string outError = ""; DateTime dtime = DateTime.Now; string fileName = Application.StartupPath + "\\EDC7 DTC\\" + DateTime.Now.ToString("yyyyMMddhhmmss") + "dtc.xls"; AsposeExcelTools.Dtc_DataTableToExcel(dt, fileName, out outError); if (!string.IsNullOrEmpty(outError)) { MessageBox.Show(outError); } else { Process.Start(fileName); } }