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Sep 23, 2011 06:36 PM|LINK
In the Solution Explorer you go to References and make sure you have System.DirectoryServices included there If you don't see it in the .net class library, that is odd. You can try browsing for it. [C:\Windows\Microsoft.Net\Framework\version\....dll ] something
like that. If you still can't find it, try reinstalling .NET framework.