采用UDP广播模式写简单信息传输工具~

答案：使用UDPClient类
这个是我写的测试代码，供参考~

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Globalization;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using System.Text;

namespace UDPWinTest
{
    /// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Button btnStart;
        private System.Windows.Forms.Button btnJoin;
        private System.Windows.Forms.TextBox txtServerIP;
        private System.Windows.Forms.Button button1;
        private System.Windows.Forms.TextBox txtMsgSend;
        private System.Windows.Forms.TextBox txtMessageMain;
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.Container components = null;

        private static UdpClient m_Client;

        private static int ListenerPort = 80;
        private static int SenderPort = 80;
        private static int LocalPort;
        private static int RemotePort;

        private static string m_szHostName;

        private static IPAddress m_GroupAddress;
        private static IPHostEntry m_LocalHost;
        private static IPEndPoint m_RemoteEP;
        private System.Windows.Forms.Button btnEnd;

        private static bool m_Done = false;
        private System.Windows.Forms.Button btnClose;

        private Thread t = null ;
        private Thread t2 = null ;

        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows 窗体设计器生成的代码
        /// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {
            this.btnStart = new System.Windows.Forms.Button();
            this.btnJoin = new System.Windows.Forms.Button();
            this.txtServerIP = new System.Windows.Forms.TextBox();
            this.txtMessageMain = new System.Windows.Forms.TextBox();
            this.txtMsgSend = new System.Windows.Forms.TextBox();
            this.button1 = new System.Windows.Forms.Button();
            this.btnEnd = new System.Windows.Forms.Button();
            this.btnClose = new System.Windows.Forms.Button();
            this.SuspendLayout();
            // 
            // btnStart
            // 
            this.btnStart.Location = new System.Drawing.Point(16, 16);
            this.btnStart.Name = "btnStart";
            this.btnStart.TabIndex = 0;
            this.btnStart.Text = "Start";
            this.btnStart.Click += new System.EventHandler(this.btnStart_Click);
            // 
            // btnJoin
            // 
            this.btnJoin.Location = new System.Drawing.Point(408, 16);
            this.btnJoin.Name = "btnJoin";
            this.btnJoin.TabIndex = 1;
            this.btnJoin.Text = "Join";
            this.btnJoin.Click += new System.EventHandler(this.btnJoin_Click);
            // 
            // txtServerIP
            // 
            this.txtServerIP.Location = new System.Drawing.Point(304, 16);
            this.txtServerIP.Name = "txtServerIP";
            this.txtServerIP.Size = new System.Drawing.Size(96, 21);
            this.txtServerIP.TabIndex = 2;
            this.txtServerIP.Text = "10.89.58.220";
            // 
            // txtMessageMain
            // 
            this.txtMessageMain.Location = new System.Drawing.Point(16, 48);
            this.txtMessageMain.Multiline = true;
            this.txtMessageMain.Name = "txtMessageMain";
            this.txtMessageMain.Size = new System.Drawing.Size(464, 184);
            this.txtMessageMain.TabIndex = 3;
            this.txtMessageMain.Text = "";
            // 
            // txtMsgSend
            // 
            this.txtMsgSend.Location = new System.Drawing.Point(16, 240);
            this.txtMsgSend.Name = "txtMsgSend";
            this.txtMsgSend.Size = new System.Drawing.Size(384, 21);
            this.txtMsgSend.TabIndex = 4;
            this.txtMsgSend.Text = "";
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(408, 240);
            this.button1.Name = "button1";
            this.button1.TabIndex = 5;
            this.button1.Text = "Send";
            this.button1.Click += new System.EventHandler(this.Send_Click);
            // 
            // btnEnd
            // 
            this.btnEnd.Location = new System.Drawing.Point(112, 16);
            this.btnEnd.Name = "btnEnd";
            this.btnEnd.TabIndex = 6;
            this.btnEnd.Text = "End";
            this.btnEnd.Click += new System.EventHandler(this.btnEnd_Click);
            // 
            // btnClose
            // 
            this.btnClose.Location = new System.Drawing.Point(208, 16);
            this.btnClose.Name = "btnClose";
            this.btnClose.TabIndex = 7;
            this.btnClose.Text = "Close";
            this.btnClose.Click += new System.EventHandler(this.btnClose_Click);
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(504, 273);
            this.Controls.Add(this.btnClose);
            this.Controls.Add(this.btnEnd);
            this.Controls.Add(this.button1);
            this.Controls.Add(this.txtMsgSend);
            this.Controls.Add(this.txtMessageMain);
            this.Controls.Add(this.txtServerIP);
            this.Controls.Add(this.btnJoin);
            this.Controls.Add(this.btnStart);
            this.Name = "Form1";
            this.Text = "UDPWinTest";
            this.ResumeLayout(false);

        }
        #endregion

        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new Form1());
        }

        private void btnStart_Click(object sender, System.EventArgs e)
        {
            LocalPort = SenderPort;
            RemotePort = ListenerPort;

            m_szHostName = Dns.GetHostName();
            m_LocalHost = Dns.GetHostByName(m_szHostName);

            AddToMain("Local Port: " + LocalPort + ", Remote: " + RemotePort);
            AddToMain("Initializing...");

            string LocalHostIP = m_LocalHost.AddressList[0].ToString();
            string[] ArrIP = LocalHostIP.Split(new char[]{'.'});
            LocalHostIP = "224" + "." + ArrIP[1] + "." + ArrIP[2] + "." + ArrIP[3];

            Initialize(LocalHostIP);

            AddToMain("Starting Listener t

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