in MvcMusicStore/Models/ShoppingCart.cs [128:163]
        public int CreateOrder(Order order)
        {
            decimal orderTotal = 0;
            var cartItems = GetCartItems();
            // Iterate over the items in the cart, adding the order details for each
            foreach (var item in cartItems)
            {
                var orderDetail = new OrderDetail
                {
                    AlbumId = item.AlbumId,
                    OrderId = order.OrderId,
                    UnitPrice = item.Album.Price,
                    Quantity = item.Count
                };
                // Set the order total of the shopping cart
                orderTotal += (item.Count * item.Album.Price);
                storeDB.OrderDetails.Add(orderDetail);
            }
            // Set the order's total to the orderTotal count
            order.Total = orderTotal;
            // Save the order
            storeDB.SaveChanges();
            // Empty the shopping cart
            EmptyCart();
            // Return the OrderId as the confirmation number
            return order.OrderId;
        }