public ActionResult Add()
 {
     int school_id = SessionHandler.GetSchoolID();
     ParentDetails _pd = new ParentDetails();
     ClassDetails _cd = new ClassDetails();
     ViewBag.parents = _pd.GetAll(school_id);
     ViewBag.classes = _cd.GetAll(school_id);
     return View();
 }
        public ActionResult Edit(int id, StudentModelView student)
        {
            int school_id = SessionHandler.GetUserID();
            var result = _sd.FindSingle(id, school_id);

            ParentDetails _pd = new ParentDetails();
            ClassDetails _cd = new ClassDetails();

            ViewBag.parents = _pd.GetAll(school_id);
            ViewBag.classes = _cd.GetAll(school_id);

            return View(result);
        }