public Boolean UpdateDishType(DishTypeDTO lst)
 {
     try
     {
         DISH_TYPE query = (from p in Context.DISH_TYPE where p.Id == lst.ID select p).SingleOrDefault();
         query.NAME = lst.NAME;
         Context.SaveChanges();
         return true;
     }
     catch (Exception ex)
     {
         throw ex;
     }
 }
 //Thêm loại món ăn vào danh sách
 public Boolean InsertDishType(DishTypeDTO lst)
 {
     try
     {
         DISH_TYPE newDishType = new DISH_TYPE() { Id = Guid.NewGuid(), NAME = lst.NAME };
       
         Context.DISH_TYPE.AddObject(newDishType);
         Context.SaveChanges();
         return true;
     }
     catch (Exception ex)
     {
         throw ex;
     }
 }
        private void tsbSave_Click(object sender, EventArgs e)
        {

            DishTypeDTO dt = new DishTypeDTO();
            if (FormState == FormStateType.New)
            {
                dt.NAME = textBox1.Text.Trim();
                rep.InsertDishType(dt);
            }
            else if (FormState == FormStateType.Edit)
            {
                dt.ID = PKEY;
                dt.NAME = textBox1.Text.Trim();
                rep.UpdateDishType(dt);
            }
            FormState = FormStateType.Normal;
            panel1.Enabled = false;
            tsbSave.Enabled = false;
            tsbCancel.Enabled = false;
            tsbAddNew.Enabled = true;
            tsbEdit.Enabled = true;
            tsbDelete.Enabled = true;
            LoadDataThucDon();
        }