Question

I am trying to make a WebForms project and ASP.NET MVC per this question. One of the things I ve done to make that happen is that I added a namespaces node to the WebForms web.config:

<pages styleSheetTheme="Default">
  ...
  <namespaces>
    <add namespace="System.Web.Mvc"/>
    <add namespace="System.Web.Mvc.Ajax"/>
    <add namespace="System.Web.Mvc.Html"/>
    <add namespace="System.Web.Routing"/>
  </namespaces>      
</pages>

However, when I try to start the project, I get an error stating: "Compiler Error Message: CS0234: The type or namespace name Mvc does not exist in the namespace System.Web (are you missing an assembly reference?)"

I have System.Web.Mvc referenced. What is the issue?

Answer 1

Add System.Web.Mvc in the compilation section,

<compilation debug="true">
    <assemblies>
        <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
        <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        <add assembly="System.Web.Abstractions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        <add assembly="System.Web.Routing, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        <add assembly="System.Web.Mvc, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
        </assemblies>
</compilation>

Answer 2

It s easier to start with an MVC project, and then start adding WebForms pages.

For your error, you will need to add references for the following assemblies:

System.Web.Mvc
System.Web.Routing
System.Web.Abstractions

There will be much more to add in the web.config to get MVC working correctly. To get it all, I d suggest creating an MVC project, and merging the web.config files.

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