Why are @Scripts and @Styles commands not be recognized in MVC4 Razor layout file?

Question

Make sure that the System.Web.Optimization.dll assembly has been referenced in your project and that the <add namespace="System.Web.Optimization"/> namespace has been added to your ~/Views/web.config file (not ~/web.config file):

<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.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Optimization"/>
        <add namespace="System.Web.Routing" />
      </namespaces>
    </pages>
</system.web.webPages.razor>

The System.Web.Optimization.dll assembly is contained within the Microsoft.AspNet.Web.Optimization NuGet, so make sure that it is installed in your project (when you create a new ASP.NET MVC 4 project in Visual Studio using the Internet Template this NuGet is automatically added to the project).

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