public IList<Order> PlaceOrders(Customer customer, IList<Order> orders)
 {
     return orders;
 }
        public IList<AbstractEntity> GetOrderAndOrderDetails(Customer customer)
        {
            var list = new List<AbstractEntity>();
            list.AddRange(customer.Orders);
            foreach (var order in customer.Orders)
            {
                foreach (var od in order.OrderDetails)
                {
                    od.EntitySetName = "OrderDetails";
                    list.Add(od);
                }
            }

            return list;
        }
 public Order PlaceOrder(Customer customer, Order order)
 {
     return order;
 }