ASP.net MVC Url.Action Link formatting

I'm very new to ASP.net and recently converting from asp.net to asp.net MVC projects. I have one basic question in asp.net MVC Url.Action.

I have one ActionResult method with two parameters QuestionId, Response in my controller, and routing configuration as follows,

public class QuestionController : Controller
{
    public ActionResult Answer(int QuestionId, string Response)
    {
       ..do something.....
    }
}

and routing configuration mapped as

routes.MapRoute(
                name: "QuestionAnswer",
                url: "{controller}/{action}/{QuestionId}/{Response}",
                defaults: new { controller ="Question", action = "Answer", QuestionId = 0, Response = string.Empty}
            );

Calling the action Link in html page from the below syntax

@Html.ActionLink("Answer is 1", "Answer", "Question", null, null, null, new RouteValueDictionary(new {QuestionId = 10, Response = "1" }), null) 

it forming URL Like /Question/Answer?QuestionID=10&Response=1, this url match the routing defintion and calls the Action properly. Everything is fine.

But my actual requirement is these parameter names should not be exposed. It should be like /Question/Answer/10/1

I don't want to manually format this link with the help of String.Format since my site may placed inside a virtual directory not as default web site.

Copyright Notice：Content Author:「Ilayaraja」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/15292532/asp-net-mvc-url-action-link-formatting