ScrollView: the ScrollX/Y is at the MAX (or END)...how do we know?

I'd like to know if the ScrollView e.ScrollX/Y has reached the END (or max scroll). Any ideas?

Currently I am using the ScrollView.Scrolled to trigger:

        private void ScrollView_Scrolled(object sender, ScrolledEventArgs e)
        {
            bool isAtWorldsEnd = false;
            if( ((ScrollView)sender).???? == e.ScrollY ) isAtWorldsEnd = true;
        }