System.DirectoryServices is not recognised in the namespace 'System'

0 votes
asked Nov 5, 2008 by jansokoly

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?

8 Answers

0 votes
answered Nov 5, 2008 by marc-gravell

Is this a web site project, or a web application project. With the latter, references are handled via the .csproj - i.e. via the "References" node in Solution Explorer.

0 votes
answered Nov 5, 2008 by mitch-wheat

Shot in the dark: have you tried adding to the web.config:

<compilation debug="true">
     <assemblies>
          <add assembly="System.DirectoryServices, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
     </assemblies>
</compilation>
0 votes
answered Nov 5, 2008 by marc-gravell

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.

0 votes
answered Nov 8, 2012 by salman-siddiqui

This is a very old thread but just to provide a complete answer for the sake of posterity ;)

This issue occurs if the project is missing a reference to the .Net Component System.DirectoryServices

Adding this reference in the usual manner prefered by you will resolve the issue.

0 votes
answered Jan 16, 2013 by user2148239

On Solution Explorer right-click your project, then from the resulting menu, click on Add Reference, then under the .NET tab navigate to DirectoryServices.AccountManagement

0 votes
answered Nov 3, 2013 by user1947015
  1. Right click on References under your solution.
  2. Select Add Reference. The reference can be found under the Framework Assemblies list. Select System.DirectoryServices and click Add.
0 votes
answered Sep 15, 2017 by basmash

I think you should install Directory Services Package.

Install-Package System.DirectoryServices -Version 4.0.0

Directory Services Package

0 votes
answered Sep 15, 2017 by navid-golforoushan

I had the same problem when I tried to convert website to web-app. It looks like vs failing to load the assembly should be related to versioning. switch to web.config and add the assembly to it as bellow. make sure the DLL version is matching your application targeted .net version.

<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.0">
      <assemblies>
        <add assembly="System.DirectoryServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
      </assemblies>
    </compilation>
  </system.web>
</configuration>

for getting a public key you need to launch Developer Command Prompt for VS.. change to GAC directory related framework on above ex C:\Windows\Microsoft.NET\Framework\v4.0.30319 and call==> sn -T System.DirectoryServices.dll

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