public ActionResult ManageTeacher()
        {
            //var TeacherList = db.Teacher.Where(x => x.ID > 0).OrderByDescending(y => y.CreatedDate).ToList();
            //ViewBag.TeacherList = TeacherList;
            //var listScience = db.Science.Where(x => x.ID > 0).OrderByDescending(y => y.CreatedDate).ToList();
            //ViewBag.listScience = listScience;
            //return View();


            var teacherDao = new TeacherDao();
            var listTeacher = teacherDao.ListAll();
            ViewBag.listTeacher = listTeacher;


            return View();
        }