Push / Pull notification of Exchange Server

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Exchange-Server

Hi
I am creating a service which connect to Exchange service and get new mail from there. I am able to get new mail from there when I execute the code manually. I need to get mail as it come to inbox. To achieve this requirement I want to use Push notification of EWS API.
I have written code for this, but I do not get any event for new mail and notification. Here is the piece of code:

I got help from the following link:
EWS Mail Notifier[^]

{
System.Net.ServicePointManager.ServerCertificateValidationCallback = delegate(
                   Object obj,
                   X509Certificate certificate,
                   X509Chain chain,
                   SslPolicyErrors errors)
                {
                    return true;
                    // TODO: check for a valid certificate
                };
                ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010);
                service.Credentials = new NetworkCredential("xxxx", "xxxx", "abc.com");
                service.Url = new Uri("https://mail.abc.com/owa/Exchange.asmx");
                service.AutodiscoverUrl("xxxx@abc.com");
               
                ServicePointManager.ServerCertificateValidationCallback = new    System.Net.Security.RemoteCertificateValidationCallback(delegate { return true; });
                AuthenticateSecureOWA("mail.abc.com", "abc.com", "xxxx", "xxxx");
                ItemView IView = new ItemView(10);
               
                FindItemsResults<Item> findResults;
                findResults = service.FindItems(WellKnownFolderName.Inbox, IView);

                PushSubscription ps = service.SubscribeToPushNotifications(
                new FolderId[] { WellKnownFolderName.Inbox },
                new Uri("http://192.168.1.1:5050"),
                5 , null ,  EventType.NewMail);
                SubscriptionId = ps.Id;
                _listener = new TcpListener(5050);
                _listener.Start();
                _th = new Thread(new ThreadStart(ProcessIncomingMessages));
                _th.Start();

}


 private void ProcessIncomingMessages()
        {
            try
            {
                for (; ; )
                {
                    CSHTTPRequest csHttpRequest = new CSHTTPRequest(_listener.AcceptTcpClient(), this);

                    csHttpRequest.Process();
                   
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

There are some other supporting files I am using to process.

Any suggestion will be appreciated
Thanks in advance.