TextToBeWritten = "Pinging 172.16.94.95... \r\n";

Ping ping = new Ping();
PingReply pingReply = ping.Send("172.16.94.95");
if (pingReply.Status == IPStatus.Success)
{
    //Machine is alive
    TextToBeWritten += "Success!";
}
else
    TextToBeWritten += "Error!";