User.Identity.IsAuthenticated = true when Membership db is empty

I deleted all the stuff from these tables but didn't log out.
select * from AspMembership.dbo.aspnet_Membership select * from AspMembership.dbo.aspnet_Profile select * from AspMembership.dbo.aspnet_Users
I refreshed the page so how come my (User.Identity.IsAuthenticated) still returns true?

thanks!
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