public Kullanici SelectedIdKullanici(int KullaniciId) { try { Kullanici responseEntitiy; using (var repo = new KullaniciRepository()) { responseEntitiy = repo.IdSelect(KullaniciId); if (responseEntitiy == null) { throw new NullReferenceException("Customer doesnt exists!"); } } return(responseEntitiy); } catch (Exception ex) { throw new Exception("BusinessLogic:CustomerBusiness::SelectCustomerById::Error occured.", ex); } }