WMI 實現Windows代理ping

使用了笨辦法取了兩次值，嘗試過ManagementOperationObserver的非同步呼叫，結果出現RPC不可用，暫時沒有時間解決這個問題，請高手看到此文給予指點，謝謝。

代碼如下：           

ConnectionOptions options = new ConnectionOptions();
            options.Username = "administrator";
            options.Password = "*********";

            ManagementScope Conn = new ManagementScope(@"\\XXX.XXX.XXX.XXX\root\cimv2", options);
            Conn.Connect();

            ObjectQuery query = new ObjectQuery("select * from win32_PingStatus where Address = 'www.sina.com.cn'");

            ManagementObjectSearcher mos =
                        new ManagementObjectSearcher(Conn, query);

            ManagementObjectCollection moc = mos.Get();

            Thread.Sleep(1000);

            moc = mos.Get();

            string m = "";

            foreach (ManagementObject mo in moc)
            {
                object obj = mo.Properties["StatusCode"].Value;

                if (obj == null)
                {
                    m = "PING 執行失敗。可能是主機未知。";
                }
                else
                {
                    if (obj.ToString().Trim() == "0")
                    {
                        m = "來自 " + mo.Properties["Address"].Value.ToString() + " 的回複, 位元組: " +
                            mo.Properties["BufferSize"].Value.ToString() + ", 時間: " + mo.Properties["ResponseTime"].Value.ToString() +
                            ", TTL: " + mo.Properties["ResponseTimeToLive"].Value.ToString();
                        break;
                    }
                }
            }

            Console.WriteLine(m);