//Thêm loại món ăn vào danh sách
 public Boolean InsertDish(DishInMenuDTO lst)
 {
     try
     {
         DISH newd = new DISH { Id = Guid.NewGuid(), NAME_EN = lst.NAME_EN, NAME_VN = lst.NAME_VN, PRICE = lst.PRICE, CODE = lst.CODE, DISHTYPE_ID = lst.DISHTYPE_ID };
         Context.DISH.AddObject(newd);
         Context.SaveChanges();
         return true;
     }
     catch (Exception ex)
     {
         throw ex;
     }
 }
 public Boolean UpdateDish(DishInMenuDTO lst)
 {
     try
     {
         DISH query = (from p in Context.DISH where p.Id == lst.ID select p).SingleOrDefault();
         query.NAME_VN = lst.NAME_VN;
         query.NAME_EN = lst.NAME_EN;
         query.CODE = lst.CODE;
         query.DISHTYPE_ID = lst.DISHTYPE_ID;
         query.PRICE = lst.PRICE;
         Context.SaveChanges();
         return true;
     }
     catch (Exception ex)
     {
         throw ex;
     }
 }
        private void tsbSave_Click(object sender, System.EventArgs e)
        {
            BindDataDishMenu();

            DishInMenuDTO dt = new DishInMenuDTO();
            if (FormState == FormBase.FormStateType.New)
            {
                dt.CODE = int.Parse(tbCode.Text);
                dt.NAME_VN = tbNameVn.Text;
                dt.NAME_EN = tbNameEn.Text;
                dt.PRICE = decimal.Parse(tbPrice.Text);
                dt.DISHTYPE_ID = PKEY1;

                repM.InsertDish(dt);
            }
            else if (FormState == FormBase.FormStateType.Edit)
            {
                dt.ID = PKEY;
                dt.CODE = int.Parse(tbCode.Text);
                dt.NAME_VN = tbNameVn.Text;
                dt.NAME_EN = tbNameEn.Text;
                dt.PRICE = decimal.Parse(tbPrice.Text);
                dt.DISHTYPE_ID = PKEY1;
                repM.UpdateDish(dt);
            }
            FormState = FormBase.FormStateType.Normal;
            tsbSave.Enabled = false;
            tsbCancel.Enabled = false;
            tbsAddNew.Enabled = true;
            tsbEdit.Enabled = true;
            tsbDelete.Enabled = true;
            LoadDataMonAn();
        }