how to create an overloaded version of a view in mvc controller

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MVC5

hey guys,am working on an online admission project in mvc3 web apllication.

i have created a class of students and use an inerface as the middle man between the web apllication and my domain to save my records perfectly.i have used a view to present the form to the users and save the record into the database.The saving aspect works perfectly.

But what i want to accomplish is surposing the student want 2 cahange some information after saving,i want the records to be overwritten and not resaved in the database.

so i want to create an overloaded version of my view to accomplish that.

I tried it and i got an error that says that it cannot perform or bind a null reference.
Then i realise the error is correct becos the record has to be saved first before the student can edit.

however i cant seem to edit find a way around editing the record. any help will be appreciated cos am stock..here is my code below.

public ViewResult Registration(int id)
    {
        Student student = studentrepository.Student.FirstOrDefault(p => p.ID == id);



        return View(student);
    }
   [HttpPost]
    public ActionResult Registration(Student student)
    {
        if (ModelState.IsValid)
        {
            studentrepository.Save(student);

        }



        return View(student);




    }