/// <summary>
/// Stop the PO service.
/// </summary>
public void Stop()
{
poBoxSubscriber.Enabled = false;
invitationSubscriber.Enabled = false;
#if (!REMOVE_OLD_INVITATION)
noAccessSubscriber.Enabled = false;
lock (typeof(POService))
{
if (subscriptionService != null)
{
// Stop the subscription thread.
subscriptionService.Stop();
subscriptionService = null;
}
}
#endif
}