public ActionResult Index(string classid)
 {
     if (classid == null)
     {
         var cms = cb.GetClasses();
         ViewBag.ClassID = new SelectList(cms, "ID", "ClassName");
         return(View(sb.GetStudentModels(cms[0].ID)));
     }
     else
     {
         var cms = cb.GetClasses();
         ViewBag.ClassID = new SelectList(cms, "ID", "ClassName");
         return(View(sb.GetStudentModels(int.Parse(classid))));
     }
 }
        public ActionResult Create()
        {
            ViewBag.ProjectID = new SelectList(pb.GetProjects(), "ID", "ProjectName");
            var cms = cb.GetClasses();

            ViewBag.ClassID = new SelectList(cms, "ID", "ClassName");
            if (cms.Count > 0)
            {
                int classid = cms[0].ID;
                ViewBag.StuNo = new SelectList(sb.GetStudentModels(classid), "StuNo", "StuName");
            }
            else
            {
                ViewBag.StuNo = new SelectList(new List <StudentModel>(), "StuNo", "StuName");
            }

            return(View());
        }