Использование ping

[tehadm]

System.Net.NetworkInformation.Ping ping = new System.Net.NetworkInformation.Ping();
            System.Net.NetworkInformation.PingReply pingReply = ping.Send("www.tehadm.ru");
            Console.WriteLine(pingReply.RoundtripTime); //время ответа
            Console.WriteLine(pingReply.Status);        //статус
            Console.WriteLine(pingReply.Address);       //IP
            Console.ReadKey(true);