public ActionResult Result(int id = 0)
{
if (id == 0 || !Permission.PremissionNeed(Request, Response, Session, UserRank.TEACHER))
{
return(null);
}
ViewBag.exam = ExamView.GetExamById(id);
ViewBag.results = ResultView.GetResultByExam(id).ToList();
return(View());
}