public ActionResult Edit(int id,Student student)
 {
     try
     {
         // TODO: Add update logic here
         unitofwork.StudentRepository.Update(student);
         unitofwork.Save();
         return RedirectToAction("Index");
     }
     catch
     {
         return View();
     }
 }
 public ActionResult Create(Student student)
 {
     try
     {
         // TODO: Add insert logic here
         unitofwork.StudentRepository.Insert(student);
         unitofwork.Save();
         return RedirectToAction("Index");
     }
     catch
     {
         return View();
     }
 }