private void cmbTDCM_tt_SelectedIndexChanged(object sender, EventArgs e)
 {
     m_NhanVienCtrl.KichHoatComboBox(cmbTDCM);
     if (cmbTDCM_tt.Text == "Bỏ Qua")
     {
         m_NhanVienCtrl.KhongKichHoatComboBox(cmbTDCM);
     }
 }