go to your
C:\WINDOWS\Microsoft.NET\Framework\v1.0.3705\CONFIG\machine.config file and
add this line to the <assemblies> section:
<add assembly="System.DirectoryServices, Version=1.0.3300.0,
Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
Your will have to stop and restart IIS server for the change to take affect.
Hope that helps,
Microsoft Developer Support AD/ADSI team
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