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Asked: 2026-05-10T20:21:26+00:00

I’m trying to use System.DirectoryServices in a web site project and I’m getting this

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I’m trying to use System.DirectoryServices in a web site project and I’m getting this error:

The type or namespace name ‘DirectoryServices’ does not exist in the namespace ‘System’ (are you missing an assembly reference?)

My project has a reference to System.DirectoryServices in web.config: 

<add assembly='System.DirectoryServices, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A'/>

And I do have using System.DirectoryServices in the files where I want to use it.

Does anybody have a clue where to look for the problem?

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1 Answer

  1. Is the web-server (IIS or whatever) configured to run the folder as an application (i.e. shows as a cog), and is it using the correct version of ASP.NET? If it is running as 1.1, bits of it might work – but it would fail to find that 2.0 assembly in the 1.1 GAC.

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