private static Car NewCar(BusinessManager businessManager) { Car car = new Car() { Name = "a" }; businessManager.Add(car); car.Name = "abc"; car.DailyPrice = 0; businessManager.Add(car); car.DailyPrice = 111; car.BrandId = 1; car.ColorId = 1; var result = businessManager.GetAll(); foreach (var item in result.Data) { var id = item.Id; car.Id = id + 1; } return(car); }