Handling sessions using session cookie

Hello,

I have created a multi-threaded Client-Server Console application.

But my client can not be only console application. It can be browser also. 

I am posting my Server source code here:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using ServerData;
using System.Net.Sockets;
using System.IO;
using System.Threading;
using System.Net;


namespace Server
{
    class Server
    {
        static Socket listenerSocket;
        static List<ClientData> clients;

        static void Main(string[] args)
        {
            Console.WriteLine("Starting a Server:" + Packet.GetIp4Addresses());
            listenerSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            clients = new List<ClientData>();

            //Create IP end point
            IPEndPoint ipe = new IPEndPoint(IPAddress.Parse(Packet.GetIp4Addresses()), 27015);

            //Bind the server socket to machine address
            listenerSocket.Bind(ipe);

            //Create listen thread and start
            Thread listenThread = new Thread(ListenThread);
            listenThread.Start();
        }

        //Listener that listens every client connection

        static void ListenThread()
        {
            for (;;)
            {
                //Listen to client socket that is trying to connect to this Server
                listenerSocket.Listen(0);
                //Add connected client to list of Clients for broadcasting purpose
                clients.Add(new ClientData(listenerSocket.Accept()));
            }
        }


        //Run the client thead which handles every client individually
        public static void Data_IN(object cSocket)
        {
            Socket clientSocket = (Socket)cSocket;
            byte[] Buffer;
            int readByteSize;

            for (;;)
            {
                try
                {
                    Buffer = new byte[clientSocket.SendBufferSize];
                    readByteSize = clientSocket.Receive(Buffer);

                    if (readByteSize > 0)
                    {
                        //Handle Data
                        Packet p = new Packet(Buffer);
                        DataManager(p,clientSocket);
                    }
                }
                catch (SocketException e)
                {
                    Console.WriteLine("Client disconnected!!");
                    Console.ReadLine();
                    Environment.Exit(0);
                }
            }
        }


        public static void DataManager(Packet p,Socket clientSocket)
        {
            switch (p.packetType)
            {
                case Packet.PacketType.Chat:
                        clientSocket.Send(p.toBytes());
                    break;
            }

        }

    }

    class ClientData
    {
        public Socket clientSocket;
        public Thread clientThread;
        String id;

        public ClientData()
        {
            id = Guid.NewGuid().ToString();
            clientThread = new Thread(Server.Data_IN);
            clientThread.Start(clientSocket);
            SendRegistrationPacket();
        }

        public ClientData(Socket clientSocket)
        {
            this.clientSocket = clientSocket;
            id = Guid.NewGuid().ToString();
            clientThread = new Thread(Server.Data_IN);
            clientThread.Start(clientSocket);
            SendRegistrationPacket();
        }

        public void SendRegistrationPacket()
        {
            Packet p = new Packet(Packet.PacketType.Registration, "server");
            p.GData.Add(id);
            clientSocket.Send(p.toBytes());
        }
    }
}

Here are my questions:

1. I have only handled client request from console client application. I also have to handle it from Web page. How can I differentiate this request type?

2. For each client request, I have to maintain session by a cookie [session cookie]. For this, my server needs be a HTTP server? I really don't understand how my above Server implementation is different from HTTP server?

3. If my server implementation is correct, how can I create session using session cookie and send it back to client?

Thank you in advance!

Navnath