Измените свой контроллер на
[HttpGet]
[ActionName("Registration")]
public ActionResult Registration_Get()
{
//Contry();
return View();
}
[HttpPost]
[ActionName("Registration")]
public ActionResult Registration_Post(Registration r)
{
//This needs to come from the view
//Registration register = new Registration();
//TryUpdateModel(r);
if (ModelState.IsValid)
{
AddStudent(r);
return RedirectToAction("Registration");
}
return View(r);
}
Вы еще не передали модель из вида