internal ContactManager()
        {
            _addPair = AddPair;

            _contactList = null;
            _contactCount = 0;
            ContactFilter = new DefaultContactFilter();
            ContactListener = new DefaultContactListener();
        }
        internal ContactManager()
        {
            _addPair = AddPair;

            _contactList    = null;
            _contactCount   = 0;
            ContactFilter   = new DefaultContactFilter();
            ContactListener = new DefaultContactListener();
        }