runtime determination of authorization

[Corno]

Hi all,

I'm making a menu page in ASP.NET in which I present the user with a list of
pages that are available to him.
In the web.config I will add a list of url's of all the pages.
Those pages have different authorization settings and I would like the menu
to
only show the user the pages that he can really open.
Authorization is role based (windows athentication in combination with
'allow'
and 'deny' in the web.config).
How do I find out at runtime if the user is authorized to view a certain
page/url?

TIA,

Corno