Send push notification on Apple (APNS) on c#.net

=======================
Please, Install your certificate *.p12 on pc, and take firend name use here for refernce.
Please, set configuration file :

<appSettings>
<add key="FriendName" value="Apple Production IOS Push Services: com.ABC.XYZ"/>
<add key="ProductionKeyFriendName" value="Production"/>
</appSettings>
==============
Send, push as per below in your class to call apns class:
Cls_APNS _Cls_APNS = new class_apns();
//Here pass custom fiels as per seprated by ";" ann asssigb value by "key=value;key=value"
_Cls_APNS.PushMessage("Message","DeviceToken",0,"id=12;name=ABC");
==================
Please create a class as per below (class_apns.cs). :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Net.Security;
using System.Net.Sockets;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Configuration;
using System.Data;
using System.Security.Authentication;
using System.IO;

namespace Push.Class
{
public class class_apns
{
String CertificateName = "";
String CertificatePwd = "";
String FriendName = "Apple Development IOS Push Services: com.ABC.XYZ";
String ProductionKeyFriendName = "Production";
SslStream sslStream;

public Cls_APNS()
{
FriendName = ConfigurationManager.AppSettings["FriendName"].ToString();
ProductionKeyFriendName = ConfigurationManager.AppSettings["ProductionKeyFriendName"].ToString();
}

public bool ConnectToAPNS()
{
X509Certificate2Collection certs = new X509Certificate2Collection();

// Add the Apple cert to our collection
certs.Add(getServerCert());

// Apple development server address
string apsHost;

if (getServerCert().ToString().Contains(ProductionKeyFriendName))
apsHost = "gateway.push.apple.com";
else
apsHost = "gateway.sandbox.push.apple.com";

// Create a TCP socket connection to the Apple server on port 2195
TcpClient tcpClient = new TcpClient(apsHost, 2195);

// Create a new SSL stream over the connection
sslStream = new SslStream(tcpClient.GetStream());

// Authenticate using the Apple cert
sslStream.AuthenticateAsClient(apsHost, certs, SslProtocols.Default, false);

//PushMessage();

return true;
}

private X509Certificate getServerCert()
{
X509Certificate test = new X509Certificate();

//Open the cert store on local machine
X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);

if (store != null)
{
// store exists, so open it and search through the certs for the Apple Cert
store.Open(OpenFlags.OpenExistingOnly | OpenFlags.ReadOnly);
X509Certificate2Collection certs = store.Certificates;

if (certs.Count > 0)
{
int i;
for (i = 0; i < certs.Count; i++)
{
X509Certificate2 cert = certs[i];

if (cert.FriendlyName.Contains(FriendName))
{
//Cert found, so return it.
return certs[i];
}
}
}
return test;
}
return test;
}

private  byte[] HexToData(string hexString)
{
if (hexString == null)
return null;

if (hexString.Length % 2 == 1)
hexString = '0' + hexString; // Up to you whether to pad the first or last byte

byte[] data = new byte[hexString.Length / 2];

for (int i = 0; i < data.Length; i++)
data[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);

return data;
}

public bool PushMessage(string Mess, string DeviceToken, int Badge, string Custom_Field)
{
ConnectToAPNS();
List<string> Key_Value_Custom_Field = new List<string>();
String cToken = DeviceToken;
String cAlert = Mess;
int iBadge = Badge;

// Ready to create the push notification
byte[] buf = new byte[256];
MemoryStream ms = new MemoryStream();
BinaryWriter bw = new BinaryWriter(ms);
bw.Write(new byte[] { 0, 0, 32 });

byte[] deviceToken = HexToData(cToken);
bw.Write(deviceToken);

bw.Write((byte)0);

// Create the APNS payload - new.caf is an audio file saved in the application bundle on the device
string msg = "";
msg = "{\"aps\":{\"alert\":\"" + cAlert + "\",\"badge\":\"" + iBadge.ToString() + "\",\"sound\":\"noti.aiff\"}";

String PayloadMess = "";
if (string.IsNullOrWhiteSpace(Custom_Field) == false)
{
List<string> list_Custom_Field = Custom_Field.Split(';').ToList();

if (list_Custom_Field.Count > 0)
{
for (int indx = 0; indx < list_Custom_Field.Count; indx++)
{
Key_Value_Custom_Field = list_Custom_Field[indx].Split('=').ToList();
if (Key_Value_Custom_Field.Count > 1)
{
if (PayloadMess != "") PayloadMess += ", ";
PayloadMess += "\"" + Key_Value_Custom_Field[0].ToString() + "\":\"" + Key_Value_Custom_Field[1].ToString() + "\"";
}
}
}
}

if (PayloadMess != "")
{
msg += ", " + PayloadMess;
}
msg += "}";

// Write the data out to the stream
bw.Write((byte)msg.Length);
bw.Write(msg.ToCharArray());
bw.Flush();

if (sslStream != null)
{
sslStream.Write(ms.ToArray());
return true;
}

return false;
}

}
}