public   void EnableDHCP()
        {

            string ethernetDescription = "{5F632379-D5A7-4F26-89FC-C172212EDF65}";
            ManagementClass wmi = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection moc = wmi.GetInstances();
            foreach (ManagementObject mo in moc)
            {
                //如果没有启用IP设置的网络设备则跳过
                /* if (!(bool)mo["IPEnabled"])
                       continue;*/
                string settingID = mo["SettingID"].ToString();
......................