Web.config

<?xml version="1.0"?>

<configuration>
  
  <!-- ... -->

  <system.web.webPages.razor>
    <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.2.7.0, 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" />
        <add namespace="SmartFormat"/>
        <add namespace="Heaventure" />
        <add namespace="Heaventure.Resources"/>
      </namespaces>
    </pages>
  </system.web.webPages.razor>

  <!-- ... -->
  
</configuration>