private void buttonAjouter_Click(object sender, EventArgs e)
 {
     if (textBoxPrenom.Text != "")
     {
         var selectedEntree  = (CarteByRestaurantAndTypeModel)comboBoxEntree.SelectedItem;
         var selectedPlat    = (CarteByRestaurantAndTypeModel)comboBoxPlat.SelectedItem;
         var selectedDessert = (CarteByRestaurantAndTypeModel)comboBoxDessert.SelectedItem;
         try
         {
             string nomTemp = helper.prenomParticipant;
             helper.prenomParticipant = textBoxPrenom.Text;
             helper.idEntree          = selectedEntree.idCarteRestaurant;
             helper.idPlat            = selectedPlat.idCarteRestaurant;
             helper.idDessert         = selectedDessert.idCarteRestaurant;
             helper.prixParPersonnes  = Int32.Parse(labelPrixTotal.Text);
             if (!Manage.GetDetailReservation().Exists(x => x.idDetailReservation == helper.idDetail))
             {
                 Manage.AjouteDetailReservation(
                     Manage.GetListReservation()
                     .FirstOrDefault(x => x.numeroReservation == helper.numeroReservation).idReservation,
                     helper.prenomParticipant, helper.idEntree, helper.idPlat, helper.idDessert,
                     helper.prixParPersonnes);
             }
             else
             {
                 int idRes = GetIdReservation();
                 Manage.ModifierDetailReservation(helper.idDetail
                                                  , textBoxPrenom.Text, helper.idEntree, helper.idPlat, helper.idDessert, helper.prixParPersonnes);
             }
             this.Hide();
             NouvelleReservationCommande oNouvelleReservationCommande = new NouvelleReservationCommande();
             oNouvelleReservationCommande.Closed   += (s, args) => this.Close();
             oNouvelleReservationCommande.MdiParent = this.MdiParent;
             oNouvelleReservationCommande.Show();
         }
         catch (Exception exception)
         {
             MessageBox.Show(exception.Message);
         }
     }
     else
     {
         MessageBox.Show("Veuillez introduire un prenom !");
     }
 }