Web Config forms authentication

[tma]

I'm attempting to do Forms authentication in my web.config but I'm having a
bit of difficulty. My web config looks like the following:

<location path="newuser.aspx"><system.web><authorization><al low
users="*"/></authorization></system.web></location>

<location path="regdataentry.aspx"><system.web><authorizatio n><allow
roles="Administrator"/><deny
users="?"/></authorization></system.web></location>
My code is the following for testing purposes. My symtom right now is that
even though the "User" role is not authorized for form "regdataentry.aspx"
it still loads.

Dim MyIdentity As New GenericIdentity("MyIdentity")

Dim MyStringArray As String() = {"User"}

Dim MyPrincipal As New GenericPrincipal(MyIdentity, MyStringArray)

Thread.CurrentPrincipal = MyPrincipalI'm

Any help is greatly appreciated.