''' 

''' Authorize function sets the access requirement of a page.
''' 
Public Overrides Sub Authorize(ByVal roles As String)
    If (IsNothing(roles) OrElse roles = "") Then
    
        ' If no login requirement specified on the page, default it to require login.
        MyBase.Authorize(BaseClasses.Utils.SystemUtils.ROLE_NOT_ANONYMOUS)        
    Else
    
        ' Else, use the login requirement specified on the page.
        MyBase.Authorize(roles)        
    End If    
End Sub