Qty

I have read that article before, but please note, I have both id and slug at the url.

Yes, that what he have too

Note that

1. The url has a slug and a ID

2. The action method has the parameter just id

3. The action filter has a method that adds the id from the slug (  Slugs.TryGetValue(slug, out id); )

public override void OnActionExecuting(ActionExecutingContext filterContext)
  {
    var slug = filterContext.RouteData.Values["slug"] as string;
    if(slug != null)
    {
      int id;
      Slugs.TryGetValue(slug, out id);
      filterContext.ActionParameters["id"] = id;
    }
    base.OnActionExecuting(filterContext);
  }