public ActionResult PostComment(int problemId, string commentText)
        {
            var     userId     = (int)Session["UserId"];
            Comment newComment = new Comment(commentText, 0, userId, problemId);

            _commentRepo.AddComment(newComment);
            ProblemModel pm = new ProblemModel();

            pm.Getproblem(problemId);
            return(RedirectToAction("Detail", new { id = problemId }));
        }
        public ActionResult Detail(int id)
        {
            if ((int)Session["UserID"] == -1)
            {
                return(RedirectToAction("Login", "User"));
            }

            ProblemModel pm = new ProblemModel();

            pm.Getproblem(id);
            return(View(pm));
        }