Redirect to 404 page programmatically using asp.net MVC

Simply return from your action:

return HttpNotFound();

Just throw out a 404 in the status code:

Response.StatusCode = (int)System.Net.HttpStatusCode.NotFound

In your web.config, add:

<customErrors mode="On" >
       <error statusCode="404" redirect="/404.shtml" />
</customErrors>

This will redirect on 404.shtml page when requested resource is not found.

Note: No need to programmatically redirect users for such situation.

EDIT: I literally suggest:

if (Context.Response.StatusCode == 404) {
  // handle this
}

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