LINQ to AD (Active Directory) provides ways of querying Active Directory using LINQ syntax and Lambda expressions.

A LINQ provider that wraps the open source Novell.DirectoryServices.Ldap library. You can communicate with any LDAP server that this library works with. To support SSL you need to get the Mono.Security.dll assembly. The LINQ provider supports updates, inserts, deletes, child objects, and much more.

LINQ to Active Directory implements a custom LINQ query provider that allows querying objects in Active Directory. Internally, queries are translated into LDAP filters which are sent to the server using the System.DirectoryServices .NET Framework library.