private List <ArchivePeriod> GetArchivePeriodTypes()
        {
            List <ArchivePeriod> archiveperiods = new List <ArchivePeriod>();

            try
            {
                return(DBHelper_AddNewOrUpdateAnalogSignalForm.GetAllArchivePeriods());
            }

            catch (Exception ex)
            {
                return(archiveperiods);

                throw;
            }
        }