Asp/net with ADirectory(fro authorisation)

[naijacoder naijacoder]

Hi,
I'm using asp.net to validate users against ADirectory(which i did)!
Now i would be Implementing Role-Based Security with GenericPrincipals
and Forms Authentication.Would i need to
have the Adirecory designed with role?For example have roles with
description like Admin,Corporate,Users etc in the Active directory
before i can use
GenericPrincipals,IsinRole etc.. for authorization which means allowing
or denying access to a particular resource, object, etc. based on the
individual user or their role membership .
Thanks in advance and ideas are all welcomed!