国外站点上转过来的资料，模拟ping程序

namespace SaurabhPing
{
    using System;
    using System.Net;
    using System.Net.Sockets;
    /// <summary>
    ///        The Main Ping Class
    /// </summary>
    class Ping
    {
    //Declare some Constant Variables
    const int SOCKET_ERROR = -1;        
    const int ICMP_ECHO = 8;
    /// <summary>
    ///        The Starting Point of the Class
    ///        It Takes the Hostname parameter
    /// </summary>
    public static void Main(string[] argv)
    {
        if(argv.Length==0)
        {
    //If user did not enter any Parameter inform him
    Console.WriteLine("Usage:Ping <hostname> /r") ;
    Console.WriteLine("<hostname> The name of the Host who you want to ping");
    Console.WriteLine("/r Ping the host continuously") ;
        }