I'm using the Facebook sdk from codeplex

I've tried the suggestion at How to get the Page Id in my Facebook Application page

which is this:

 if (FacebookWebContext.Current.SignedRequest != null) 
{   
dynamic data = FacebookWebContext.Current.SignedRequest.Data; 
if (data.page != null)   
{
        var pageId = (String)data.page.id;
        var isUserAdmin = (Boolean)data.page.admin;
        var userLikesPage = (Boolean)data.page.liked; 
  }  
  else 
  {
        // not on a page  
  } 
}

But my data.page is null.

Do I need to ask for some extra permissions on the authorization or something?

Also tried this the FQL suggested at http://blog.woodylabs.com/2010/09/facebook-graph-api-is-user-a-fan-of-page-id-using-fql-and-opengraph-to-mimic-pages-isfan/

But I only have an appId not a page ID.

Any ideas?