What is the proper way to send an HTTP 404 response from an ASP.NET MVC action?

Question

If given the route:

{FeedName}/{ItemPermalink}

ex: /Blog/Hello-World

If the item doesn\'t exist, I want to return a 404. What is the

Answer 1

We do it like so; this code is found in BaseController

/// 

/// returns our standard page not found view
/// 
protected ViewResult PageNotFound()
{
    Response.StatusCode = 404;
    return View("PageNotFound");
}

called like so

public ActionResult ShowUserDetails(int? id)
{        
    // make sure we have a valid ID
    if (!id.HasValue) return PageNotFound();