ขอโค้ด Receive หน่อยน้าคะ จาก Send ดังนี้ using System;using System.Collections.Generic;

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Runtime.Serialization.Formatters.Binary;

namespace picturesend
{
    public partial class Form1 : Form
    {
        UdpClient send, receive;
        IPEndPoint sendpt, receivept;
        
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
           Thread t = new Thread(new ThreadStart(picsend));
           t.IsBackground.CompareTo(true);
            t.Start();

          
        }

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog mydialog = new OpenFileDialog();
            if (mydialog.ShowDialog() == DialogResult.OK)
            {
                string path = mydialog.FileName;
                FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read);
                BinaryReader br = new BinaryReader(fs);
                byte[] data = br.ReadBytes(Convert.ToInt16(fs.Length));
                send = new UdpClient();
                sendpt=new IPEndPoint(IPAddress.Parse("127.0.0.1"),3333);
                send.Send(data,data.Length,sendpt);
                send.Close();

                
            }
        }
        
        public void picsend()
        {
            receive = new UdpClient(3333);
            do
            {
                try
                {
                   byte[] pic = receive.Receive(ref receivept);
                   using (MemoryStream ms = new MemoryStream(pic, 0, pic.Length))
                   {
                       ms.Write(pic, 0, pic.Length);
                       Image im = Image.FromStream(ms, true);
                       pictureBox1.Image = im;
                   }
                  
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.ToString());
                }
            } while (true);
        }
    }
}