Inheritance and stereotypes and common functions

[cloudsoup]

A question about the best way to represent server-side web pages.

In the administration area of a website most of my ASP pages will have a check to see that the client is logged in under a valid admin account - redirecting to a login area if they're not.

How best to represent this?

Firstly, if this were implemented via inheritance in a .NET application, would it be appropriate for me to create a stereotype (although then the functionality wouldn't be specified anywhere).

Secondly, if this were implemented in a call to a common library function, I don't really want to tediously specify that in every single server page. Another sterotype, this time with a tagged value, maybe?

I don't know - I'd be grateful for suggestions.