ADSI:
Overview
Active Directory and Microsoft .NET - 18/10/04
Using Network Functions in Visual C#.NET (Part II - Group Functions)
Active Directory \ Directory Services
How to get the list of groups that a user is a member of
Using Active Directory In ASP.NET - Enumerate Active Directory Users
Introduction to System.DirectoryServices, Part 1
.Net Directory Services Programming - C# - Part 2 - DirectoryEntry Binding and AD Properties
Learning ADSI - Part 2: Editing Users and Administering Groups
Tales from the Script - Apr 2005
Mastering the LDAP search filter - 30/05/06
Querying Active Directory using .NET classes and LDAP queries - 31/05/03
Accessing Active Directory Through the .NET Framework
System.DirectoryServices Namespace
ADSI Section
Learning ADSI - Part 2: Editing Users and Administering Groups
HOWTO: Speed Up ADSI Group & Dist. List Membership Checks
How to Programmatically Add Members to Groups
Add to Your ADSI Code Library