public ActionResult Index(SubjectIndex subject)
 {
     if (ModelState.IsValid)
     {
         _db.Subjects.Add(subject.NewSubject);
         _db.SaveChanges();
         return RedirectToAction("Index");
     }
     subject.ListSubjects = _db.Subjects.List();
     return View(subject);
 }
        //
        // GET: /Subjects/
        public ViewResult Index(int id = 1)
        {
            var model = new SubjectIndex { ListSubjects = _db.Subjects.List() };

            return View(model);
        }