private void cmbConcerne_DropDownClosed(object sender, EventArgs e)
        {
            cmbChoix.IsEnabled = true;

            switch (cmbConcerne.Text)
            {
            case CLASSE:
                codes = notificationBL.listerValeurColonneClasse("codeclasse");
                cmbChoix.ItemsSource = codes;
                cmbChoix.Items.Refresh();
                break;

            case SERIE:
                codes = notificationBL.listerValeurColonneSerie("codeserie");
                cmbChoix.ItemsSource = codes;
                cmbChoix.Items.Refresh();
                break;

            case CYCLE:
                codes = notificationBL.listerValeurColonneCycle("codecycle");
                cmbChoix.ItemsSource = codes;
                cmbChoix.Items.Refresh();
                break;

            case NIVEAU:
                codes = notificationBL.listerValeurColonneNiveau("codeniveau");
                cmbChoix.ItemsSource = codes;
                cmbChoix.Items.Refresh();
                break;

            case MIXTE:
                cmbChoix.Text      = "";
                cmbChoix.IsEnabled = false;
                break;

            default:
                break;
            }
        }