Get Mac Address C#

Question

public List<string> GetMacAddress()
        {
            var list = new List<string>();
            foreach (NetworkInterface networkInterface in NetworkInterface.GetAllNetworkInterfaces())
            {
                if (networkInterface.NetworkInterfaceType == NetworkInterfaceType.Ethernet && networkInterface.OperationalStatus == OperationalStatus.Up)
                {
                    list.Add(networkInterface.GetPhysicalAddress().ToString());
                }
                   
            }

            return list;
        }