如何在ASP.NET中实现基于权限的授权？

I'm working an a ASP.NET application (not using MVC) and need a User-Role-Permission based authorization scheeme, where pages and/or methods can demand the specific permission they require (instead of which role the user has). Is there a way to extend Forms Authentication (or building something) to solve this?I'm working an a ASP.NET application (not using