public ActionResult AddHint(HintViewModel hint)
        {
            if (ModelState.IsValid)
            {
                Hint newHint = new Hint()
                {
                    IdQuestion = hint.IdQuestion,
                    Hint1 = hint.HintDescription
                };

                hintRepository.CreateNewHint(newHint);
                hintRepository.SaveChanges();

                return RedirectToAction("ListHints", "Admin", new { idQuestion = hint.IdQuestion });
            }
            else
            {
                return RedirectToAction("AddHint", "Admin");
            }
        }
        public ActionResult EditHint(HintViewModel hint)
        {
            Hint activeHint = hintRepository.GetHintByID(hint.IdHint);

            if (activeHint != null && activeHint.Hint1 != null)
            {
                activeHint.Hint1 = hint.HintDescription;
                activeHint.IdQuestion = hint.IdQuestion;

                hintRepository.SaveChanges();
            }

            return RedirectToAction("ListHints", "Admin", new { idQuestion = hint.IdQuestion });
        }