C# .NET ช่วยดูโค้ดให้หน่อยนะคะ การรับ-ส่ง Transfer ไฟล์ ระหว่าง PC ผ่าน Socket

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Net; // For Using Network Programming Classes
using System.Net.Sockets; // For Using Socket Classes
using System.IO; // For Input Output Streams Classes
using System.Threading; // For Multi Threading In the Same App

namespace send1
{
    public partial class Form1 : Form
    {
        int groupPort = 6666;
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            MessageBox.Show("คลิกส่งละนะ");
            send();
        }
        void send()
        {
            MessageBox.Show("เริ่ม");
            Socket client_sock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            IPEndPoint groupEP = new IPEndPoint(IPAddress.Parse("255.255.255.255"), groupPort);

            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);

            FileStream fs = new FileStream(@"C:\test.png", FileMode.Open, FileAccess.Read);
            BinaryReader binFile = new BinaryReader(fs);

            byte[] downBuffer = new byte[1024000];
           //byte[] downBuffer = Encoding.ASCII.GetBytes(binFile);


            int bytesSize = 0;
            while ((bytesSize = binFile.Read(downBuffer, 0, downBuffer.Length)) > 0)
            {
                try
                {
                    byte[] buffer = BitConverter.GetBytes(downBuffer.Length);
                    socket.SendTo(buffer, groupEP);
                    MessageBox.Show("ส่งภาพได้แล้วจ้า");
                }
                catch
                {
                    MessageBox.Show("ยังส่งไมได้เลยน๊ะ");
                }
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Net; // For Using Network Programming Classes
using System.Net.Sockets; // For Using Socket Classes
using System.IO; // For Input Output Streams Classes
using System.Threading; // For Multi Threading In the Same App

namespace receive1
{
    public partial class Form1 : Form
    {
        byte[] buffer = new byte[1024000];
        //string stringData1;
        Socket sock1;
        IPEndPoint iep1;
        EndPoint ep1; 
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            try
            {
                sock1 = new Socket(AddressFamily.InterNetwork,SocketType.Dgram, ProtocolType.Udp);
                iep1 = new IPEndPoint(IPAddress.Any, 6666);
                sock1.Bind(iep1);
                ep1 = (EndPoint)iep1;
                CallData();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error1 Load",MessageBoxButtons.OK, MessageBoxIcon.Error);
            }     
           
        }
        private void CallData()
        {
            sock1.BeginReceiveFrom(buffer, 0, buffer.Length, SocketFlags.None, ref ep1, new AsyncCallback(revImage), ep1);
        }

        private void revImage(IAsyncResult ar)
        {
            try
            {
                // stringData1 = Encoding.UTF8.GetString(buffer);

                int downbuffer = BitConverter.ToInt32(buffer, 0);
                sock1.EndReceiveFrom(ar, ref ep1);
                while (true)
                {
                    //byte[] downbuffer =         
                    MemoryStream ms = new MemoryStream(downbuffer);

                    Image bmp = Image.FromStream(ms);
                    pictureBox1.Image = bmp;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error OnReceive!!");
            }
        }
        }
        
    }