public bool deleteLogData() { if (!open()) { return(false); } try { axCZKEM1.EnableDevice(iMachineNumber, true); //enable the device FileHelper.writeToLog("Deleting records"); //txt_error.Text = "Deleting records"; //axCZKEM1.DeleteAttlogBetweenTheDate(iMachineNumber, "7/5/2012", "8/5/2012"); //YYYY - MM - DD hh: mm: ss bool ret = axCZKEM1.DeleteAttlogBetweenTheDate(iMachineNumber, "2018-8-29 00:00:00", "2018-8-30 23:59:59"); //bool ret = axCZKEM1.DeleteAttlogByTime(iMachineNumber, "2018-1-23 00:00:00"); //bool ret = axCZKEM1.ClearGLog(iMachineNumber); if (!ret) { int idwErrorCode = 0; axCZKEM1.GetLastError(ref idwErrorCode); NotificationHelper.CreateNotification("Operation failed, ErrorCode = " + idwErrorCode.ToString()); FileHelper.writeToLog("Operation failed, ErrorCode = " + idwErrorCode.ToString()); } return(false); } catch (Exception e) { FileHelper.writeToLog(e.Message); } return(false); }