Applying SQL til min server application

Hej jeg står her som et stort sort hold.

Jeg ved ikke hvordan jeg får sql tilføjet mit server program og gør så man kan hente oplysninger ud fra den.

Nogle der kan hjælpe?!

Her er min Scource

using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Collections;

public class Server
{
    // Instance variable to hold names and addresses
    private Hashtable addressTable;

    // main method to start the erver application
    public static void Main()
    {
        Server s = new Server();
        s.Start();
    }

    public Server()
    {
        Console.WriteLine("Initializing Server data");
        // Set up names and addresses
        addressTable = new Hashtable(10);
        addressTable.Add("Kasper", "d66");
        addressTable.Add("Nick", "a1");
        addressTable.Add("Martin", "kommer altid for sent");
        addressTable.Add("Thomas", "a2");
    }

    public void Start()
    {

        Socket serverSocket = null;
        Socket socket = null;
        NetworkStream stream = null;
        StreamWriter writer = null;
        StreamReader reader = null;

        Console.WriteLine("Starting server");
        try
        {
            // Register service on port 1234
            Console.WriteLine("Applying IP");
            string strHostName = Dns.GetHostName();
            IPHostEntry ipEntry = Dns.GetHostByName(strHostName);
            IPAddress[] addr = ipEntry.AddressList;
            serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            serverSocket.Bind(new IPEndPoint(addr[0], 1234)); // evt lige kig i addr og se om noget kan bruges først. Har ikke selv testet dette.

            Console.WriteLine("Server is now ready");
            serverSocket.Listen(0);
            //Wait for a connection from a client
            while (true)
            {
                //Wait here and listen for a connection
                Console.WriteLine("Waiting for client connection ...");
                // Accepting a connection provides a socket to handle
                // client-server communications
                socket = serverSocket.Accept();
                Console.WriteLine("Connection Accepted");
                stream = new NetworkStream(socket);
                reader = new StreamReader(stream);
                writer = new StreamWriter(stream);

                Console.WriteLine("Reading client data");
                String queryString = reader.ReadLine();
                Console.WriteLine("Client data is : {0} ", queryString);

                // Now obtain information from addressTable
                // need to cast the result to a string as Object is returned
                // by default
                String result = (string)addressTable[queryString];

                Console.WriteLine("Result is {0} ", result);

                // Return information to client
                // Get a communications stream from the socket
                Console.WriteLine("Sending data to client");
                writer.Write(result);
                writer.Flush();
                Console.WriteLine("Data sent, closing connection");

                reader.Close();
                reader = null;
                writer.Close();
                writer = null;
                socket.Close();
                socket = null;
            }
        }
        catch (SocketException e)
        {
            Console.WriteLine("Error initializing Socket: " + e.ToString());
        }
        catch (IOException exp)
        {
            Console.WriteLine("Error in Socket Communication: " + exp.ToString());
        }
    }
}