public ActionResult Edit_Ajax(int id)
        {
            TeacherDataController controller = new TeacherDataController();
            Teacher teacher = controller.getTeacher(id);

            return(View(teacher));
        }
        public ActionResult Show(int?teacherId)
        {
            TeacherDataController controller = new TeacherDataController();
            Teacher teacher = controller.getTeacher(teacherId);

            return(View(teacher));
        }