elmah.ir-post122-code6.cs

public Guid PlaceOrder(Guid customerId, ShoppingCart shoppingCart)
{
    foreach (var item in shoppingCart.Items)
    {
      if (item.Quantity == 0)
      {
        throw new InvalidOrderException();
      }
    }
    var customer = _customerService.GetCustomer(customerId);

    //Open Session
    var orderFulfillmentSessionId = _orderFulfillmentService.OpenSession(USERNAME, PASSWORD);

    var firstItemId = shoppingCart.Items[0].ItemId;
    var firstItemQuantity = shoppingCart.Items[0].Quantity;

    //Place Order
    var orderForFulfillmentService = new Dictionary();
    orderForFulfillmentService.Add(firstItemId, firstItemQuantity);
    var orderPlaced = _orderFulfillmentService.PlaceOrder(orderFulfillmentSessionId, 
      orderForFulfillmentService, 
      customer.ShippingAddress.ToString());

    //Check Inventory Level
    var itemIsInInventory = _orderFulfillmentService.IsInInventory(orderFulfillmentSessionId, firstItemId, firstItemQuantity);

    //Close Session
    _orderFulfillmentService.CloseSession(orderFulfillmentSessionId);

    var order = new Order();
    return _orderDataService.Save(order);
}