Silverlight 4 page authentication attribute

In Asp.net M开发者_StackOverflow社区VC you can do:

[Authorize]
public class someController{}

Is there a way you can do this in silverlight pages? I saw a guy do this with his own code here. Is there anything built in silverlight like this?

Here is an article that give a decent overview of using ASP.NET Membership from within Silverlight:

http://www.silverlightshow.net/items/Leveraging-the-ASP.NET-Membership-in-Silverlight.aspx