private void MigrateShoppingCart(string UserName)
        {
            // Associate shopping cart items with logged-in user
            var cart = ShoppingCartFinder.FindShoppingCart();
            var newShoppingCartId = ShoppingCartFinder.SetShoppingCartId(UserName);

            if (cart.Id == newShoppingCartId)
            {
                return;// already migrated
            }
            var newCart = cart.MigrateCart(newShoppingCartId);

            session.Delete(cart);
            session.Store(newCart);
            session.SaveChanges();
        }