public void AddOrderedDish(Ordered_Dish o)
{
if (order_by_high_price(o.OrderCode) == false)
{
throw new Exception("it's imposible to order order at this price");
}
if (o.Amount < 1)
{
throw new Exception("the amount is wrong!");
}
//if (order_by_hechsher(o.OrderCode, o.DishCode) == false)
// throw new Exception("the hechsher dish is not suitable for this order...");
dal.AddOrderedDish(o);
}