Framework for adding users/groups/permissions functionality to an application (possibly integrating with AD)?

I am looking to see if there is a good library or framework that I can use to simplify addi开发者_如何学Gong user/group/permission management to a .Net application (4.0 VS2010). If the framework can work on it's own or integrate with Active Directory that would be a huge bonus.

So far I have found Visual Guard, if you have any experience using Visual Guard to provide user/group/permission functionality I definitely want to hear your feedback on how you liked working with it, pitfalls and benefits

My suggestion would be to use Declarative security... here is a link to the MSDN Security Action Attribute which I have used quite often, particularly in web apps to insure proper credentials