public JsonResult ListTeacher(Teacher teacher)
        {
            if (teacher == null)
            {
                return(Json(new { Message = "Error", HasError = true }));
            }

            var dao  = new TeacherDAO();
            var List = dao.ListTeacher();

            if (!List.Any())
            {
                return(Json(new { Message = "No entry found" }));
            }

            return(Json(List, JsonRequestBehavior.AllowGet));
        }