List User account form AD
                            
                         
                        
                     
                 
                
                    Dear All
I'm a newbie on c#.net.
What namespace should i use in c#.net in order to access the objects from AD? I know .Net framework include a lot of built-in name space / classes, but i don't know if there is any resource that can tell me what these classes do.
Thanks
Jack