Ping in C#

有時候需要知道另一部電腦是否還"活著",可以這樣做...
private void btn_Click(object sender, EventArgs e)
{
try
{
Ping ping = new Ping();
PingReply pingreply = ping.Send("xxx.xxx.xxx.xxx");//IP Address
MessageBox.Show(pingreply.Status.ToString());
}
catch (Exception err)
{
MessageBox.Show(err.Message);
}
}
記得要using System.Net.NetworkInformation 這個NameSpace