public ActionResult Index(InstructorModels.AddQuestionsModel model)
        {
            var      course = db.Courses.Single(x => x.Id == model.CourseId);
            Question que    = new Question {
                QuestionText = model.QuestionText, Course = course
            };
            Answer ans1 = new Answer {
                AnswerText = model.Answer1, Question = que
            };
            Answer ans2 = new Answer {
                AnswerText = model.Answer2, Question = que
            };
            Answer ans3 = new Answer {
                AnswerText = model.Answer3, Question = que
            };
            CorrectAnswer corAns = new CorrectAnswer {
                AnswerText = model.CorrectAnswer, Question = que
            };

            que.QuestionText = model.QuestionText;
            var user = db.AspNetUsers.Single(u => u.UserName == "*****@*****.**");

            db.Questions.Add(que);
            db.Answers.Add(ans1);
            db.Answers.Add(ans2);
            db.Answers.Add(ans3);
            db.CorrectAnswers.Add(corAns);
            db.SaveChanges();
            return(RedirectToAction("Index"));
        }
        // GET: Teacher
        public ActionResult Index()
        {
            InstructorModels.AddQuestionsModel model = new InstructorModels.AddQuestionsModel();
            var user = db.AspNetUsers.Single(u => u.UserName == User.Identity.Name);

            foreach (CourseInstructor assignment in db.CourseInstructors)
            {
                if (assignment.AspNetUser == user)
                {
                    model.InstructorCourses.Add(assignment.Course);
                }
            }
            return(View(model));
        }