.NET Active Directory Wrapper    
Access Active Directory From Your C# or VB .Net Code

Active Directory
Object Properties

DirectoryServices Namespace
DirectoryEntry Class

How to .. in C# .NET
Create User
Disable User
Enable User
Authenticate a User
Change User Password
Get DirectoryEntry of a user
Get Users in a Group
Get Object Property

Other Resources

Active Directory Object Properties

Every object in Active Directory can hold properties that describe that object.

The properties of an object defined using an Active Directory Schema model. The schema may for example identify the properties and any relationships that may exist between them.