public ActionResult StudentResult(Guid?key) { if (key == null) { return(new HttpStatusCodeResult(HttpStatusCode.BadRequest)); } Lecture lecture = _lectureService.GetLecture((Guid)key); if (lecture == null) { return(HttpNotFound()); } ResultHelper resultHelper = new ResultHelper(); IEnumerable <Result_View> results = resultHelper.GetByLecture(lecture); ViewBag.Lecture = lecture; return(View(results)); }