Ambiguous action methods in MVC 2

I'm having some problems with ambiguous action methods in MVC 2. I've tried implementing the solution found here: ASP.NET MVC ambiguous action methods, but that simply gives me a "The resource cannot be found" error as it thinks I'm trying to invoke the action method I don't want to invoke. The RequiredRequestValueAttr开发者_开发知识库ibute class I'm using is the exact same one as what was in the other question's solution:

public class RequireRequestValueAttribute : ActionMethodSelectorAttribute
{
    public RequireRequestValueAttribute(string valueName)
    {
        ValueName = valueName;
    }
    public override bool IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo)
    {
        return (controllerContext.HttpContext.Request[ValueName] != null);
    }
    public string ValueName { get; private set; }
}

My action methods are:

    //
    // GET: /Reviews/ShowReview/ID

    [RequireRequestValue("id")]
    public ActionResult ShowReview(int id)
    {
        var game = _gameRepository.GetGame(id);

        return View(game);
    }

    //
    // GET: /Reviews/ShowReview/Title

    [RequireRequestValue("title")]
    public ActionResult ShowReview(string title)
    {
        var game = _gameRepository.GetGame(title);

        return View(game);
    }

Right now, I'm trying to use the int id version, and instead it's invoking the string title version.

This solution assumes that you must absolutely use the same URL regardless of if you're selecting by ID or name, and that your route is set up to pass a value to this method from the URL.

[RequireRequestValue("gameIdentifier")]
public ActionResult ShowReview(string gameIdentifier)
{
    int gameId;
    Game game = null;
    var isInteger = Int32.TryParse(gameIdentifier, out gameId);

    if(isInteger)
    {
      game = _gameRepository.GetGame(gameId);
    }
    else
    {
      game = _gameRepository.GetGame(gameIdentifier);
    }

    return View(game);
}

Update: According to Microsoft: "Action methods cannot be overloaded based on parameters. Action methods can be overloaded when they are disambiguated with attributes such as NonActionAttribute or AcceptVerbsAttribute."