In one of my projects there was a requirement to get the unique list of members from a given DG, which may have multiple levels of nested DGs. So, I thought of using the “System.DirectoryServices” namespace with “DirectoryEntry” & “DirectorySearcher” classes. But the challenge was to recursively expand the nested DGs and eliminate the duplicates across all nested DGs. I planned to write a recursive method which will do this. But, fortunately I found out that .NET Framework 3.5 introduced a new namespace “System.DirectoryServices.AccountManagement” which has more sophisticated methods to deal with AD. I started using the GroupPrincipal.GetMembers(bool recursive) method which did the job for me. Awesome… I just thought of sharing this as I spent quite a time in finding this solution. HAPPY CODING!!!