public HttpResponseMessage GetCar(string carId) { Car car = carBusiness.GetCar(carId); if (car == null) { var message = string.Format("Car not found"); HttpError error = new HttpError(message); return(Request.CreateResponse(HttpStatusCode.NotFound, error)); } else { GetCarDto getCarDto = new GetCarDto(car); return(Request.CreateResponse(HttpStatusCode.OK, getCarDto)); } }