public ActionResult Index(string ClassName)
        {
            ClassRoomService service          = new ClassRoomService();
            int pageNumber                    = 1;
            IPagedList <ClassRoom> classRooms = service.GetClassRoom(ClassName
                                                                     , pageNumber
                                                                     , 10
                                                                     );

            ViewBag.ClassName   = ClassName;
            ViewBag.PageCurrent = pageNumber;
            return(View(classRooms));
        }
        public ActionResult Index(string ClassRoomName, int?CurrentPage)
        {
            ClassRoomService service          = new ClassRoomService();
            int pageNumber                    = CurrentPage ?? 1;
            IPagedList <ClassRoom> classRooms = service.GetClassRoom(ClassRoomName
                                                                     , pageNumber
                                                                     , 10
                                                                     );

            ViewBag.StudentCode = ClassRoomName;
            ViewBag.PageCurrent = CurrentPage;
            return(View(classRooms));
        }