I do the extension of the UserPrincipal class to retrieve some missing properties that i need: [DirectoryObjectClass("user")] [DirectoryRdnPrefix("CN")] class UserPrincipalExt : UserPrincipal { p...

Can't find anything in the MSDN documentation on this. I.e. is it enough to do, say: using(PrincipalSearcher searcher = ...) { foreach (var principal in searcher.FindAll()) { ... do something ...