private void AddNewClient(object sender, RoutedEventArgs e) { if (System.Windows.Forms.MessageBox.Show("Confirmer l'enregistrement de ce client ?", "Attention", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1) == System.Windows.Forms.DialogResult.Yes) { Client_Controller client = new Client_Controller(Client_Model.ExistingClients.Count, Nom.Text, Prenom.Text, Adresse.Text, Telephone.Text, Mail.Text, 0); Client_Model.AddNewClient(client); MainWindow m = new MainWindow(); m.Activate(); m.Show(); this.Close(); } }