public static void UnsetDNS()
        {
            var CurrentInterface = GetActiveEthernetOrWifiNetworkInterface();
            if (CurrentInterface == null) return;

            ManagementClass objMC = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection objMOC = objMC.GetInstances();
            foreach (ManagementObject objMO in objMOC)
            {
                if ((bool)objMO["IPEnabled"])
                {
                    if (objMO["Description"].ToString().Equals(CurrentInterface.Description))
                    {
                        ManagementBaseObject objdns = objMO.GetMethodParameters("SetDNSServerSearchOrder");
                        if (objdns != null)
                        {
                            objdns["DNSServerSearchOrder"] = null;
                            objMO.InvokeMethod("SetDNSServerSearchOrder", objdns, null);
                        }
                    }
                }
            }
        }

public static void UnsetDNS()
        {
            var CurrentInterface = GetActiveEthernetOrWifiNetworkInterface();
            if (CurrentInterface == null) return;

            ManagementClass objMC = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection objMOC = objMC.GetInstances();
            foreach (ManagementObject objMO in objMOC)
            {
                if ((bool)objMO["IPEnabled"])
                {
                    if (objMO["Description"].ToString().Equals(CurrentInterface.Description))
                    {
                        ManagementBaseObject objdns = objMO.GetMethodParameters("SetDNSServerSearchOrder");
                        if (objdns != null)
                        {
                            objdns["DNSServerSearchOrder"] = null;
                            objMO.InvokeMethod("SetDNSServerSearchOrder", objdns, null);
                        }
                    }
                }
            }
        }