Ping

using System;//j a  va  2  s . co m
using System.Net.NetworkInformation;

class MainClass
{
    public static void Main(string[] args)
    {
        using (Ping ping = new Ping())
        {
             try
             {
                 PingReply reply = ping.Send("127.0.0.1", 100);

                 if (reply.Status == IPStatus.Success)
                 {
                   Console.WriteLine("Success - IP Address:{0} Time:{1}ms",
                       reply.Address, reply.RoundtripTime);
                 }
                 else
                 {
                     Console.WriteLine(reply.Status);
                 }
             }
             catch (Exception ex)
             {
                 Console.WriteLine("Error ({0})", ex.InnerException.Message);
             }
        }
    }
}