System.DirectoryServices compilation problems

I'm using the code here : ASP.NET How to get List of Groups in Active Directory

Specifically :

using System.DirectoryServices;

DirectoryEntry objADAM = default(Directory开发者_运维知识库Entry); //compiler error!

Problem: compiler says that it doesn't know what DirectoryEntry is.

I tried to add it to my web.config:

      <assemblies>
          <!-- ... -->
          <add assembly="System.DirectoryServices, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
      </assemblies>

But it didn't seem to help so I tried to add a reference:

Someone suggested setting Copy Local = True but that didn't help either.

I noticed that I don't see a reference for System.DirectoryServices - only System.DirectoryServices.Accountmanagement

Can anyone help me get this code to compile? I'm not sure what to try next.

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Take the .net 3.5 filter off in the Add Reference dialog, and then put a reference in your project to:

System.DirectoryServices, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a

You can take the filter off by changing you project setting : http://msdn.microsoft.com/en-us/library/bb398202.aspx

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If you want to use the DirectoryEntry from the System.DirectoryServices namespace - you need to add a reference to the System.DirectoryServices assembly - NOT the System.DirectoryServices.AccountManagement assembly!