public static bool setDNS(string dns)
        {
            bool result = true;
            ManagementClass mcNetworkAdapter = new ManagementClass("Win32_NetworkAdapter");
            ManagementClass mcNetworkConfiguration = new ManagementClass("Win32_NetworkAdapterConfiguration");
            foreach (ManagementObject mo in mcNetworkConfiguration.GetInstances())
            {
                if ((bool)mo["IPEnabled"] == true)
                {
                    //mo.InvokeMethod("SetDNSServerSearchOrder", new string[]{dns});
                    mo.InvokeMethod("SetDNSServerSearchOrder",new Object[]{dns,""});
                    foreach (ManagementObject mo2 in mcNetworkAdapter.GetInstances())
                    {
                        if ((int)mo2["index"] == (int)mo["index"])
                        {
                            mo2.InvokeMethod("Disable", new object[] { });
                            mo2.InvokeMethod("Enable", new object[] { });
                            break;
                        }
                    }
                }
            }

            return result;
        }