public void AfficherVol() { ListeVols = new ObservableCollection <Vol>(); ListeVols = DAL_Vol.SelectVols(); this.grid.ItemsSource = ListeVols; this.trajet.ItemsSource = DAL_Trajet.SelectStrTrajets(); this.avion.ItemsSource = DAL_Avion.SelectMatriculeAvions(); this.Trajet.ItemsSource = DAL_Trajet.SelectStrTrajets(); this.Trajet.SelectedValue = DAL_Trajet.SelectStrTrajets().First(); this.Avion.ItemsSource = DAL_Avion.SelectMatriculeAvions(); this.Avion.SelectedValue = DAL_Avion.SelectMatriculeAvions().First(); }