Group Chat Example

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 MulticastChat

{

    public partial class Form1 : Form

    {

        Socket cs;

        Thread t;

        IPEndPoint gip;

        public Form1()

        {

            InitializeComponent();

            gip = new IPEndPoint(IPAddress.Parse(GroupIptextBox.Text), 7080);

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            try

            {

                panel1.Enabled = false;

            }

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

            }

        }

        public void Receive()

        {

            try

            {

                EndPoint ep = (EndPoint)gip;

                byte[] data = new byte[2048];

                string Msg;

                int recv;

                while (true)

                {

                    recv = cs.ReceiveFrom(data, ref ep);

                    Msg = Encoding.ASCII.GetString(data, 0, recv);

                    string UserName = "";

                    UserName = Msg.Substring(0, Msg.IndexOf(":"));

                    Msg = Msg.Substring(Msg.IndexOf(":") + 1);

                    ReceverichTextBox.Text = ReceverichTextBox.Text + UserName + " : " + Msg + "\n";

                }

            }

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

            }

        }

        private void Sendbutton_Click(object sender, EventArgs e)

        {

            try

            {

                byte[] msg = Encoding.ASCII.GetBytes(UserNametextBox.Text + " : " + SendtextBox.Text);

                SendtextBox.Clear();

                cs.SendTo(msg, SocketFlags.None, gip);

            }

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

            }

        }

        private void Connectbutton_Click(object sender, EventArgs e)

        {

            try

            {

                if (GroupIptextBox.Text != "")

                {

                    if (UserNametextBox.Text != "")

                    {

                        if (Connectbutton.Text == "Connect")

                        {

                            cs = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

                            IPEndPoint ipe = new IPEndPoint(IPAddress.Any, 7080);

                            cs.Bind(ipe);

                            cs.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.AddMembership, new MulticastOption(IPAddress.Parse("224.10.0.1")));

                            t = new Thread(new ThreadStart(Receive));

                            t.IsBackground = true;

                            t.Start();

                            panel1.Enabled = true;

                            Connectbutton.Text = "Disconnect";

                            GroupIptextBox.ReadOnly = true;

                            UserNametextBox.ReadOnly = true;

                        }

                        else if (Connectbutton.Text == "Disconnect")

                        {

                            t.Abort();

                            cs.Close();

                            GroupIptextBox.ReadOnly = false;

                            UserNametextBox.ReadOnly = false;

                            panel1.Enabled = false;

                            Connectbutton.Text = "Connect";

                        }

                    }

                    else

                    {

                        MessageBox.Show("Please Enter Your Name...", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information);

                    }

                }

                else

                {

                    MessageBox.Show("Please Enter Group Ip...", "Warning", MessageBoxButtons.OK, MessageBoxIcon.Warning);

                }

            }

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);

            }

        }

    }

}