Cacher is the code snippet organizer for pro developers

 int port = 2195;
       String hostname = "gateway.sandbox.push.apple.com";

       //load certificate
       string certificatePath = @"cert.p12";
       string certificatePassword = "";
       X509Certificate2 clientCertificate = new X509Certificate2(certificatePath, certificatePassword);
       X509Certificate2Collection certificatesCollection = new X509Certificate2Collection(clientCertificate);

       TcpClient client = new TcpClient(hostname, port);
       SslStream sslStream = new SslStream(
                       client.GetStream(),
                       false,
                       new RemoteCertificateValidationCallback(ValidateServerCertificate),
                       null
       );

       try
       {
               sslStream.AuthenticateAsClient(hostname, certificatesCollection, SslProtocols.Tls, true);
       }
       catch (AuthenticationException ex)
       {
               client.Close();
               return;
       }

       // Encode a test message into a byte array.
       MemoryStream memoryStream = new MemoryStream();
       BinaryWriter writer = new BinaryWriter(memoryStream);

       writer.Write((byte)0);  //The command
       writer.Write((byte)0);  //The first byte of the deviceId length (big-endian first byte)
       writer.Write((byte)32); //The deviceId length (big-endian second byte)

       String deviceId = "DEVICEIDGOESHERE";
       writer.Write(ToByteArray(deviceId.ToUpper()));

       String payload = "{\"aps\":{\"alert\":\"I like spoons also\",\"badge\":14}}";

       writer.Write((byte)0); //First byte of payload length; (big-endian first byte)
       writer.Write((byte)payload.Length);     //payload length (big-endian second byte)

       byte[] b1 = System.Text.Encoding.UTF8.GetBytes(payload);
       writer.Write(b1);
       writer.Flush();

       byte[] array = memoryStream.ToArray();
       sslStream.Write(array);
       sslStream.Flush();

       // Close the client connection.
       client.Close();