void IINGService.CreateAccount(Account account)
 {
     using (var database = new INGDBEntities())
     {
         database.Accounts.Add(account);
         database.SaveChanges();
     }
 }
 bool IINGService.AddPayment(Payment payment)
 {
     using (var database = new INGDBEntities())
     {
         var sender   = database.Accounts.Find(payment.id_sender);
         var reciever = database.Accounts.Find(payment.id_reciever);
         if (sender == null || reciever == null || sender.balance < payment.amount)
         {
             return(false);
         }
         database.Payments.Add(payment);
         sender.balance   -= payment.amount;
         reciever.balance += payment.amount;
         database.SaveChanges();
         return(true);
     }
 }