public override void ViewDidDisappear(bool animated)
        {
            if (is_bt_available)
            {
                BTPacketHandler.StopInquiry();
            }

            base.ViewDidDisappear(animated);
        }
 void aleart_Dismissed(object sender, UIButtonEventArgs e)
 {
     if (e.ButtonIndex == 0)
     {
         // canceled
     }
     else
     {
         // OK
         BTPacketHandler.StartInquiry();
         is_bt_available = true;
     }
 }