On my machine, I have both Visual Studio.Net Professional and Visual Studio.Net 2003 Professional installed. I have a need to do some work with Active Directory. When I add the statement, "using System.DirectoryServices;" I get the error "The type or namespace name &#039;DirectoryServices&#039; does not exist in the class or namespace &#039;System&#039; (are you missing an assembly reference?)". What is going on here? Is there an assembly I am supposed to have manually included. Please advise.<BR><BR>Thank you!<BR>