public ActionResult Index(int?FacilityID)
        {
            List <Facility> Facilities = BUSFacility.GetFacilities();

            ViewBag.Facilities = new SelectList(Facilities, "ID", "Name");

            List <Classroom> Clasro = BUSClassroom.GetClassroomsByFacilityID02(FacilityID.HasValue ? FacilityID.Value : Facilities.First().ID);

            return(View(Clasro));
        }
        public ActionResult GetClassroomsByFacilityID02(int ID)
        {
            List <Classroom> classes = BUSClassroom.GetClassroomsByFacilityID02(ID);

            var newclasses = classes
                             .Select(s => new
            {
                ID   = s.ID,
                Name = s.Name
            }
                                     ).ToList();


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