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using System.Net.Sockets;

using System.Net;using System.Threading;

namespace ChatUDPVersion

{     public partial class frmChat : Form    {         delegate void SetTextCallback(string text);

        bool isOpen = true;

        Thread thread;

        public frmChat()

        {             InitializeComponent();        }

        private void btnSend_Click(object sender, EventArgs e)

        {                      UdpClient clientSend = new UdpClient(Dns.GetHostName(), 8008);            try            {                 Byte[] sendInfo = Encoding.Default.GetBytes(tbSend.Text);                clientSend.Send(sendInfo, sendInfo.Length);                tbSend.Text = string.Empty;            }            catch(Exception ex)            {                 MessageBox.Show(ex.Message);            }            finally            {                 clientSend.Close();            }        }        private void GetMessage()        {             UdpClient client = new UdpClient(8008);            IPEndPoint ipRemoteEndPoint = new IPEndPoint(IPAddress.Any, 8008);            byte[] receInfo;            while (isOpen)            {                 try                {                     receInfo = client.Receive(ref ipRemoteEndPoint);                }                catch (Exception ex)                {                     MessageBox.Show(ex.Message);                    break;                }                AddMessage(Encoding.Default.GetString(receInfo));            }            client.Close();        }

        public void AddMessage(string message)

        {             if (this.lbReceive.InvokeRequired)            {                 SetTextCallback d = new SetTextCallback(AddMessage);                this.Invoke(d, new object[] { message });            }            else            {                 lbReceive.Items.Add(message);            }        }

        private void frmChat_Load(object sender, EventArgs e)

        {                        thread = new Thread(new ThreadStart(this.GetMessage));            thread.IsBackground = true;            thread.Start();           }

        private void frmChat_FormClosing(object sender, FormClosingEventArgs e)

        {             isOpen = false;            Application.Exit();        }    }} 

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