The name 'Styles' does not exist in the current context The name 'Scripts' does not exist in the current context

When i insert  @Styles.Render("~/

Content/themes/base/css", "~/Content/css")  @Scripts.Render("~/bundles/modernizr")  in my MVC 4 Empty project i get the following error The name 'Styles' does not exist in the current context

The name 'Scripts' does not exist in the current context

Solution

Open Web.config file from view/web.config

 and add the namespace "System.Web.Optimization" under namespace tag

  <system.web.webPages.razor>

    <host factoryType="System.Web.Mvc.

MvcWebRazorHostFactory, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />

    <pages pageBaseType="System.Web.Mvc.

WebViewPage">

      <namespaces>       .

       .

       .

        <add namespace="System.Web.

Optimization" />

      </namespaces>

    </pages>

  </system.web.webPages.razor>

Similarly open root/web.config file and do above changes
 Then restart the procet