nh3-mvc-create-order.cs

public int CreateOrder(Order order)
{
    using (var tx = storeDB.Session.BeginTransaction())
    {
        var cartItems = GetCartItems();

        //Iterate the items in the cart, adding Order Details for each
        foreach (var cartItem in cartItems)
        {
            var orderDetail = new OrderDetail
            {
                Album = cartItem.Album,
                Order = order,
                UnitPrice = cartItem.Album.Price
            };

            order.OrderDetails.Add(orderDetail);
        }

        //Save the order
        storeDB.Session.Save(order);
        tx.Commit();
    }

    //Empty the shopping cart
    EmptyCart();

    //Return the OrderId as a confirmation number
    return order.OrderId;
}