Security :: Page Not Recognizing Signed In Status

I am using the aspnet membership features and check to make sure the user is logged in before display the page:

Protected
Sub Page_Load(ByVal sender
As
Object,
ByVal e
As System.EventArgs)
Handles
Me
.Load
'Check for UserName
If Context.User.Identity.Name
Is
Nothing
Or IsDBNull(Context.User.Identity.Name)
Or Context.User.Identity.Name =
String.Empty
Then
Response.Redirect(
"~/Login.aspx"
)
End
If
Session(
"UserName"
) = Context.User.Identity.Name
UserName.Text = Session(
"UserName"
)
UserIDValue.Text = Membership.GetUser().ProviderUserKey.ToString()
End
Sub

Everything was working fine when I had two separate applications (two web.config files) using the same data base and the same "applicationName" in the web.config files...............