public IActionResult Quiz()
        {
            QuizModel qModel = QuizModel.Instance;

            qModel.Reset();
            qModel.Start();
            return(View(qModel));
        }
        public IActionResult Quiz(QuizModel qModel, string action)
        {
            qModel = QuizModel.Instance;

            if (Request.Form["userAnswer"] != "")
            {
                qModel.userAnswer = Int32.Parse(Request.Form["userAnswer"]);
                qModel.Check();

                if (action == "Next")
                {
                    QuizModel quModel = QuizModel.Instance;
                    quModel.Start();
                    return(View(quModel));
                }
                return(RedirectToAction("QuizResult"));
            }
            else
            {
                QuizModel quModel = QuizModel.Instance;
                return(View(quModel));
            }
        }