private void btnAddTimePeriods_Click(object sender, EventArgs e)
        {
            CreateTimePeriod frmCreateTimeperiod = new CreateTimePeriod();

            frmCreateTimeperiod.ImportFile = ImportFile;
            frmCreateTimeperiod.MainTable  = _table;
            frmCreateTimeperiod.ShowDialog();
        }
 private void btnAddTimePeriods_Click(object sender, EventArgs e)
 {
     CreateTimePeriod frmCreateTimeperiod = new CreateTimePeriod();
     frmCreateTimeperiod.ImportFile = ImportFile;
     frmCreateTimeperiod.MainTable = _table;
     frmCreateTimeperiod.ShowDialog();
 }