/// <summary>
        /// 获取网卡MacAddress
        /// </summary>
        /// <returns></returns>
        public static string getID_NetCardId()
        {
            string NCid = "";
            ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection moc = mc.GetInstances();
            foreach (ManagementObject mo in moc)
            {
                if ((bool)mo["IPEnabled"] == true)
                    NCid = mo["MacAddress"].ToString();
                mo.Dispose();
            }
            return NCid;
        }