private void button1_Click(object sender, EventArgs e)
 {
     if (PKEY == null) return;
     DishRepostitory rep = new DishRepostitory();
     rep.SaveComment(PKEY, txtCOMMENT.Text);
     refresh();
 }
 private void refresh()
 {
     DishRepostitory rep = new DishRepostitory();
     List<DishDTO> lst = rep.GetDishList(order_id);
     grvDISH.DataSource = lst;
 }