Only allow access to action if redirected from specific action

Question

Is there a good way to restrict the access to an action, so you can only access it, if you were redirected from another action. For example:

    [HttpPost]
    public virtual ActionResult Create(MyViewModel vm)
    {            
        if (ModelState.IsValid)
        {
            // do some work

            return RedirectToAction("CreateSuccess");
        }
        else
        {
            return View(vm);
        }
    }


    public virtual ActionResult CreateSuccess()
    {
        // only allow execution if you were redirected from Action "Create" 
    }

Answer 1

An easy way would be to store a flag in TempData in the first method and check that the flag exists in the method that is redirected to.
TempData is there to pass state information between action requests and will only last the duration of the request so you will not need to worry about clearing it down.

Answer 2

There is no way to know the "from" action unless you include parameters indicating such. The easiest way is to append a "SourceAction" or "FromAction" parameter and check it in the "destination" action.