Hi Charlie,

To get the form authentication cookie, you may get the cookie name from:

FormsAuthentication.FormsCookieName

However, the cookie is encrypted, and we cannot get its actual value.

Regarding the issue, since the content are accessible to both of
Authenticated user and others, you can just leave the content public. Is
this right?

If you have private and public content on a same web form, you may consider
following work around:

When perform form authentication, you can add a cookie by yourself,
indcating the user has been authenticated. And then,  arrange pages based
on this cookie value.

Hope this help,

Luke
Microsoft Online Support

Dear Charlie,

You don't need to arrange the authenticated pages inside a folder.  You can specify the pages (say if they are minimum 5 pages etc.,) using location path.  in that, you can also specify to allow the users, for whom you gave an userid.  the following illustration shows the same:-

<location path="ProtectedPage1.aspx">
   <system.web>
     <authorization>
        <allow users="UserId" />
       <deny users="*" />
     </authorization>
   </system.web>
</location>

the above, would allow users with the above userid (whatever you give) and will deny all other users (anonymous and logged in).  

however, in case you want to allow users with above userid as well as their own userid (logged in), change the <deny users="?" />.  this will restrict only people
who are not logged in.

To check whether the user is logged in, use

if(User.Identity.IsAuthenticated)
{

}

to get the User's Id, use

User.Identity.Name

hope it helps.