Complications when upgrading from ASP MVC 3 Preview 1 to beta

Question

I have just upgraded my ASP MVC 3 application from the preview to the beta version. In preview everything worked fine, but as soon as I upgraded weird things started to happen.

I get this error message:

Compiler Error Message: CS0234: The type or namespace name 'Helpers' does not exist in the namespace 'System.Web' (are you missing an assembly reference?)

Source File: c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root\1512250b\962d050c\App_Web_index.cshtml.a8d08dba.kncxiw31.0.cs Line: 19

I have tried to completly rebuild the application, and to clear the temporary asp.net files, but nothing works. My solution builds successfully, no errors while building. But when i try to open the website, I get this error.

These are my referenced dll's:

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.1

Screenshot of the error message:

Any thoughts?

Answer 1

After intense searching I found some answers in the ASP.NET MVC 3 release notes. There is a section called Upgrading an ASP.NET MVC 2 Project to ASP.NET MVC 3 which tell you what to do:

Add the two following lines into your <assemblies> section in your web.config:

<add assembly="System.Web.WebPages, Version=1.0.0.0, Culture=neutral, 
     PublicKeyToken=31BF3856AD364E35" />

<add assembly="System.Web.Helpers, Version=1.0.0.0, Culture=neutral,
     PublicKeyToken=31BF3856AD364E35" />