List Doesn't Working in asp.net mvc4

Question

Error Type:

There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'Course_ID'.

 

Hi Everyone i am facing a problem as above using asp.net MVC4 technology.

 Controller:

[HttpGet]

public ActionResult Register(int id)

{

    Student_Mgt student = new Student_Mgt(); 

   IEnumerable<SelectListItem> list = new SelectList(db.Courses.ToList(), "Course_ID",    "Course_Name");

   ViewBag.SelectCourses = list;

   return View(student);

}

 

[HttpPost]

[ActionName("Register")]

public ActionResult RegisterPost(Student_Mgt Student)

{

   if (ModelState.IsValid)

   {

      db.Student_Mgt.Add(Student);

      db.SaveChanges();

      return RedirectToAction("List_Enquiries", "Main");

   }

   else

   {

      return View();

   }

 

}

 

View 

@Html.DropDownListFor(m=>m.Course_ID,ViewBag.SelectCourses as IEnumerable<SelectListItem>, "Select Course" ,new {@id="courses",@class="form-control"})