private void BoutonEffacer_Click(object sender, RoutedEventArgs e)
        {
            BLL.BLL BLL_DELETE_CONTACT = new BLL.BLL();

            if (BLL_DELETE_CONTACT.deleteContact(phoneAeffacer.Text))
            {
                messageDelete.Text = "Contact deleted";
                phoneAeffacer.Text = "";
            }
            else
            {
                messageDelete.Text = "No contact found";
            }
        }