LDAP (Active Directory) Programming with C#

1. .NET Support 2 sets of classes of Active Directory(AD) operations.
2. System.DirectoryServices
   Older class, supports from .net 1.0. Supports all AD operations (setting password, enable/disable account, reterive AD objects).
3. System.DirectoryServices.AccountManagement
   Newer version (>=3.5), easier to manage AD operations. Usign UserPrincipal object to access LDAP object.