bool online = false; //是否在线
Ping ping = new Ping();
PingReply pingReply = ping.Send("192.168.132.191");
if (pingReply.Status == IPStatus.Success)
{
online = true;
Console.WriteLine("当前在线，已ping通！");
}
else
{
Console.WriteLine("不在线，ping不通！");
}
原文地址：http://blog.csdn.net/zht666/article/details/24592021
