[dll] The name 'ViewBag' does not exist in the current context

I had the same problem in a solution that had been upgraded to MVC 5 in Visual Studio 2015.

In the web.config file within the Views folder (not the root web.config), I updated the version number referred to in <configSections> from 2.0.0.0 to 3.0.0.0.

<configuration>
    <configSections>
      <sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">
        <section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
        <section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />
      </sectionGroup>
  </configSections>

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