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public class PingChangeMonitor : ChangeMonitor
    {
        private string _uniqueId;
        private string ipAddress;
        private Timer timer;

        /// <param name="interval">Timer interval in miliseconds</param>
        public PingChangeMonitor(string ipAddress, double interval)
        {
            _uniqueId = Guid.NewGuid().ToString("N", CultureInfo.InvariantCulture);
            this.ipAddress = ipAddress;
            timer = new Timer(interval);
            timer.Enabled = true;
            timer.Elapsed += Timer_Elapsed;

            base.InitializationComplete();
        }

        private void Timer_Elapsed( object sender, ElapsedEventArgs e )
        {
            Ping ping = new Ping();
            var reply = ping.Send(ipAddress);
            if(reply.Status != IPStatus.Success)
            OnChanged(null);
        }

        public override string UniqueId
        {
            get { return _uniqueId; }
        }

        protected override void Dispose( bool disposing )
        {
            
        }
    }