private void Effectuer_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                GestionClientVueModele vm = (GestionClientVueModele)this.DataContext;
                string resultat           = vm.EffectuerAction(GrilleClients.SelectedIndex);
                this.DataContext = new GestionClientVueModele();
                MessageBox.Show(resultat);
            }

            catch (ExceptionAccesBD err)
            {
                MessageBox.Show(err.details);
            }
            catch (Exception err)
            {
                MessageBox.Show(err.Message);
            }
        }