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C# socket server with windows form application
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace mserver1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ServerClass sc = new ServerClass();
            sc.startServer(textBox1, richTextBox1);
        }
    }


    public class ServerClass
    {
        public void startServer(TextBox tb, RichTextBox rb)
        {

            IPEndPoint ip = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9939);
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

            socket.Bind(ip);
            socket.Listen(20);
            rb.Text = rb.Text + "Waiting for client...";
            Socket client = socket.Accept();
            IPEndPoint clientep = (IPEndPoint)client.RemoteEndPoint;

            rb.Text = rb.Text + "Connected with " + clientep.Address + " at port " + clientep.Port;

            string welcome = tb.Text;
            byte[] data = new byte[1024];
            data = Encoding.ASCII.GetBytes(welcome);
            client.Send(data, data.Length, SocketFlags.None);

            rb.Text = rb.Text + "Disconnected from" + clientep.Address;
            client.Close();
            socket.Close();
        }
    }
}