public void AddCard(Contractor _Contractor, string CardCode) { CardsLogic cardsLogic = new CardsLogic(manager); WareCard card = cardsLogic.GetByCode(CardCode); if (card != null) { ContractorCard contractorCard = new ContractorCard(); contractorCard.CardID = card.ID; _Contractor.ContractorCards.Add(contractorCard); context.AddToContractorCards(contractorCard); } }