public void Pay(string username)
{
var payedOrder =
_unitOfWork.Repository <Order>()
.FindBy(x => x.User != null && x.User.Username == username)
.FirstOrDefault(x => x.IsConfirmed && !x.IsShipped);
if (payedOrder == null)
{
throw new ValidationException("There is no order for payed", "Order");
}
payedOrder.IsPayed = true;
_unitOfWork.Repository <Order>().Edit(payedOrder);
IObservable observable = MailServer.CreateServer(_unitOfWork);
observable.NotifyObserver(payedOrder);
}
