Asp.Net MVC: How do I enable dashes in my urls?

/MyController/MyAction

/My-Controller/My-Action

[ActionName("My-Action")]
public ActionResult MyAction() {
    return View();
}

public class HyphenatedRouteHandler : MvcRouteHandler{
        protected override IHttpHandler  GetHttpHandler(RequestContext requestContext)
        {
            requestContext.RouteData.Values["controller"] = requestContext.RouteData.Values["controller"].ToString().Replace("-", "_");
            requestContext.RouteData.Values["action"] = requestContext.RouteData.Values["action"].ToString().Replace("-", "_");
            return base.GetHttpHandler(requestContext);
        }
    }

routes.Add(
            new Route("{controller}/{action}/{id}",
                new RouteValueDictionary(
                    new { controller = "Default", action = "Index", id = "" }),
                    new HyphenatedRouteHandler())
        );