//获得网卡序列号     public string GetMoAddress()     {         string MoAddress = " ";         ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");         ManagementObjectCollection moc2 = mc.GetInstances();         foreach (ManagementObject mo in moc2)         {             if ((bool)mo["IPEnabled"] == true)                 MoAddress = mo["MacAddress"].ToString();             mo.Dispose();         }         return MoAddress.ToString();     }