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. NET Framework Class Library: system. directoryservices namespace
Http://msdn.microsoft.com/library/en-us/cpref/html/frlrfsystemdirectoryservices.asp

How to poll for changes to the Active Directory by using Visual C #. net
Http://support.microsoft.com/default.aspx? Id = 326091

How to: Add a user to the local system by using directory services and Visual C #. net
Http://support.microsoft.com/default.aspx? Id = 306273

How to: Access ADSI objects in Visual C #. net
Http://support.microsoft.com/default.aspx? Id = 315716

Using Active Directory in ASP. NET-enumerate Active Directory users
Http://www.codeproject.com/aspnet/adsi2.asp

Querying active directory using. Net classes and LDAP queries
Http://www.codeproject.com/dotnet/activedirquery.asp

How to get the list of groups that a user is a member
Http://www.codeproject.com/dotnet/usergroupmembership.asp