ping ip

private void Form1_Load(object sender, EventArgs e)
        {
            string ip = "202.96.128.191";
            string str = cmdIP(ip);
            Console.WriteLine(str);
            Console.ReadLine();
            MessageBox.Show(str);
        }
        private static string cmdIP(string strip)
        {
            Process p = new Process();
            p.StartInfo.FileName = "cmd.exe";
            p.StartInfo.UseShellExecute = false;
            p.StartInfo.RedirectStandardInput = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.RedirectStandardError = true;
            p.StartInfo.CreateNoWindow = true;
            string pingstr;
            p.Start();
            p.StandardInput.WriteLine("ping -n 1 " + strip);
            p.StandardInput.WriteLine("exit");
            string stre = p.StandardOutput.ReadToEnd();
            if (stre.IndexOf("(0%loss)") != -1)
                pingstr = "连接";
            else if (stre.IndexOf("Destination host unreachable.") != -1)
                pingstr = "无法达到目的的主机";
            else if (stre.IndexOf("Request timed out.") != -1)
                pingstr = "超时";
            else if (stre.IndexOf("Unknown host") != -1)
                pingstr = "无法解析主机";
            else
                pingstr ="网络连接成功！";
            p.Close();
            return pingstr;
        }

以上使用过，成功

以下没试过

int timeout = 120;
            PingReply reply = pingSender.Send("10.58.1.132", timeout);
            if (reply.Status == IPStatus.Success)
            {
                MessageBox.Show("能ping通 ");
            }
            else
            {
                MessageBox.Show("ping不通");
            }