http://blog.csdn.net/andrew_wx/article/details/6628501

using System.Net.NetworkInformation;  namespace PingExample{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void btn_StartPing_Click(object sender, EventArgs e)        {            this.lst_PingResult.Items.Clear();            //远程服务器IP            string ipStr = txt_IPAddress.Text.ToString().Trim();            //构造Ping实例            Ping pingSender = new Ping();            //Ping 选项设置            PingOptions options = new PingOptions();            options.DontFragment = true;            //测试数据            string data = "test data abcabc";            byte[] buffer = Encoding.ASCII.GetBytes(data);            //设置超时时间            int timeout = 120;            //调用同步 send 方法发送数据,将返回结果保存至PingReply实例            PingReply reply = pingSender.Send(ipStr, timeout, buffer, options);            if (reply.Status == IPStatus.Success)            {                lst_PingResult.Items.Add("答复的主机地址：" + reply.Address.ToString());                lst_PingResult.Items.Add("往返时间：" + reply.RoundtripTime);                lst_PingResult.Items.Add("生存时间（TTL）：" + reply.Options.Ttl);                lst_PingResult.Items.Add("是否控制数据包的分段：" + reply.Options.DontFragment);                lst_PingResult.Items.Add("缓冲区大小：" + reply.Buffer.Length);            }            else                lst_PingResult.Items.Add(reply.Status.ToString());        }    }}