The following code example uses the IsAuthenticated property to determine whether the current request has been authenticated. If it has not been authenticated, the request is redirected to another page where users can enter their credentials into the Web application. This is a common technique used in the default page for an application.
PrivateSub Page_Load(sender AsObject, e As EventArgs)
' Check whether the current request has been' authenticated. If it has not, redirect the ' user to the Login.aspx page.If (Request.IsAuthenticated = False) Then