public void UpdateAddress(Address address, string country, string city, string street, string build, out string alert) { if (country == null || city == null || street == null || build == null) { alert = "Couldn't update address! One of the fields is null."; return; } else { address.Country = country; address.City = city; address.Street = street; address.Build = build; _addressDAL.UpdateAddress(address); alert = "Address update successfully"; } }