‫Highlight کردن لینک صفحه جاری در ASP.NET MVC

public static MvcHtmlString MenuLink(this HtmlHelper helper, string text, string action, string controller)
{            
    var routeData = helper.ViewContext.RouteData.Values;
    var currentController = routeData["controller"];
    var currentAction = routeData["action"];             
 
    if(String.Equals(action, currentAction as string,
              StringComparison.OrdinalIgnoreCase)
        &&
       String.Equals(controller, currentController as string,
               StringComparison.OrdinalIgnoreCase))
        
    {
       return helper.ActionLink(
           text,action, controller, null,
           new { @class="currentMenuItem"}
           );
    }
    return helper.ActionLink(text, action, controller);
}

<li>@Html.MenuLink("Contact", "Contact", "Home")</li>

ul#menu li a {
    background: none;
    color: #999;
    padding: 5px;
    border-radius: 15px;
    text-decoration: none;
}
 
ul#menu li a.currentMenuItem {
    background-color: black;   
    color: white;
}

public static MvcHtmlString MenuLinkBootstrap(this HtmlHelper helper, string text, string action, string controller)
{

    var routeData = helper.ViewContext.RouteData.Values;
    var currentController = routeData["controller"];
    var currentAction = routeData["action"];

   if (String.Equals(action, currentAction as string, StringComparison.OrdinalIgnoreCase) && String.Equals(controller, currentController as string, StringComparison.OrdinalIgnoreCase))
   {
        return new MvcHtmlString("<li class=\"active\">" + helper.ActionLink(text, action, controller) + "</li>");
   }
   
    return new MvcHtmlString("<li>" + helper.ActionLink(text, action, controller) + "</li>");

}