public static void AddNewTraiders(BussinesService bussinesService) { IDataContex dataContext = bussinesService.GetDataContex(); Traider existTraider = dataContext.Traiders.AsEnumerable().LastOrDefault(); int newID = 0; if (existTraider != null) { newID = existTraider.ID; } List <Traider> traiders = new List <Traider>() { new Traider() { ID = ++newID, FirstName = "Black", Surname = "Whiteson", PhoneNum = "34872642891" }, new Traider() { ID = ++newID, FirstName = "Red", Surname = "Greenson", PhoneNum = "56454" }, new Traider() { ID = ++newID, FirstName = "Homer(Doy!)", Surname = "Simpson", PhoneNum = "1241414" }, new Traider() { ID = ++newID, FirstName = "Marge", Surname = "Simpson", PhoneNum = "67868313" }, new Traider() { ID = ++newID, FirstName = "Bart(Ay caramba!)", Surname = "Simpson", PhoneNum = "231897193" } }; foreach (Traider traider in traiders) { bussinesService.AddNewTraiderWithStarterPack(traider); } }