Adding “active” tag to navigation list in an asp.net mvc master page

Question

In the default asp.net mvc project, in the Site.Master file, there is a menu navigation list:

Answer 1

Here is the version compatible with the current version of MVC4.
I have rewritten Adam Carr's code as an extension method.

using System;
using System.Web.Mvc;
using System.Web.Mvc.Html;
using System.Web.Routing;

namespace MyApp.Web {
    public static class HtmlHelpers {
        /// 

        /// Returns an anchor element (a element) that contains the virtual path of the
        /// specified action. If the controller name matches the active controller, the
        /// css class 'current' will be applied.
        /// 
        public static MvcHtmlString MenuActionLink(this HtmlHelper helper, string linkText, string actionName, string controllerName) {
            var htmlAttributes = new RouteValueDictionary();
            string name = helper.ViewContext.Controller.GetType().Name;

            if (name.Equals(controllerName + "Controller", StringComparison.OrdinalIgnoreCase))
                htmlAttributes.Add("class", "current");

            return helper.ActionLink(linkText, actionName, controllerName, new RouteValueDictionary(), htmlAttributes);
        }
    }
}