title: selected menu item in mvc3
body: <p>I am creating my first mvc3 application (no previous mvc either) I am wanting to create a top level menu and be able to add a "selected" or "active" css class to the select LI tag. I found this link <a href="https://stackoverflow.com/questions/4728777/active-menu-item-asp-net-mvc3-master-page">active menu item - asp.net mvc3 master page</a> Ihave tried to add it to a class however I get an error back "Error   1   'System.Web.Mvc.HtmlHelper' does not contain a definition for 'ActionLink' and no extension method 'ActionLink' accepting a first argument of type 'System.Web.Mvc.HtmlHelper' could be found (are you missing a using directive or an assembly reference?) G:\MvcMusicStore-v2.0\MvcMusicStore-Completed\MvcMusicStore\Helpers\HtmlHelpers.cs  26  31  MvcMusicStore
  "</p>
  
  <p>So I am thinking I am missing a reference to something however I don't know what. Can someone kindly tell me what I need to reference to get this to work.</p>