C# to obtain a simple example of LAN MAC address

/// <summary>
/// Obtain the physical address of the network card
        /// </summary>
        /// <returns></returns>
        public static string getMAC()
        {
            string madAddr = null;
            ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
            ManagementObjectCollection moc2 = ();
            foreach (ManagementObject mo in moc2)
            {
                if ((mo["IPEnabled"]) == true)
                {
                    madAddr = mo["MacAddress"].ToString();
                    madAddr = (':', '-');
                }
                ();
            }
            return madAddr;
        }