Server

using System;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Server
{
    public partial class Server : Form
    {
        public Server()
        {
            InitializeComponent();
        }
        TcpListener tcpListener;
        MemoryStream ms;
        Stopwatch stopWatch = new Stopwatch();
        public Bitmap ImageFromScreen()
        {
            Rectangle screenSize = Screen.PrimaryScreen.Bounds;
            Bitmap target = new Bitmap(screenSize.Width, screenSize.Height);
            using (Graphics g = Graphics.FromImage(target))
                g.CopyFromScreen(0, 0, 0, 0, new Size(screenSize.Width, screenSize.Height));
            return target;
        }
        private async void Timer1_Tick(object sender, EventArgs e)
        {
            using (ms = new MemoryStream())
                ImageFromScreen().Save(ms, ImageFormat.Jpeg);
            TcpClient tcpClient = await tcpListener.AcceptTcpClientAsync();
            using (NetworkStream networkStream = tcpClient.GetStream())
            {
                byte[] lengthPrefix = BitConverter.GetBytes(ms.ToArray().Length);
                byte[] ret = new byte[lengthPrefix.Length + ms.ToArray().Length];
                lengthPrefix.CopyTo(ret, 0);
                ms.ToArray().CopyTo(ret, lengthPrefix.Length);
                await networkStream.WriteAsync(ret, 0, ret.Length);
            }
        }
        private void Button1_Click(object sender, EventArgs e)
        {
            tcpListener =  TcpListener.Create(8888);
            tcpListener.Start();
            label1.Text = "online";
            timer1.Start();
        }
    }
}