How to implement granular role based security in ASP.NET.

ASP.NET role manager provides an API that enables you to manage application roles, add and remove users from roles, and check role membership, but it does not allow you to query whether a user is authorized to perform a named task or operation.I?m using Forms Authentication with membership API. I wanted to implement authorization at operation level. Can somebody point me out at good article? How to implement it using SQL.
(NOTE: I have gone microsoft?s AzMan but it doesn?t work with Forms Authenticatio ...