public ActionResult EditTeacher(int id)
        {
            CreateT model = new CreateT()
            {
                Positions = db.Positions.ToList(),
                Teacher   = db.Teachers.FirstOrDefault(t => t.Id == id),
                Action    = "EditTeacher"
            };

            return(View("CrtTeacher", model));
        }
        public ActionResult CrtTeacher()
        {
            CreateT model = new CreateT()
            {
                Positions = db.Positions.ToList(),
                Teacher   = null,
                Action    = "CreateTeacher"
            };

            return(View(model));
        }