private void btn_sup_Click(object sender, EventArgs e)
 {
     vari      = new Models.Variete();
     vari._num = int.Parse(txt_num.Text);
     vm.SupprimerVariete(vari);
     RemplirComboBox();
 }
 private void btn_mod_Click(object sender, EventArgs e)
 {
     vari                      = new Models.Variete();
     vari._num                 = int.Parse(txt_num.Text);
     vari._nomVariete          = txt_nom.Text;
     vari._culture._numCulture = int.Parse(CB_num.Text);
     vm.ModifierVariete(vari);
     RemplirComboBox();
 }