MAC Address

        public void GetMacAddress()
        {
            string qry = "select * FROM Win32_NetworkAdapter";
            System.Management.ObjectQuery objectQuery = new System.Management.ObjectQuery(qry);
            System.Management.ManagementObjectSearcher searcher = new System.Management.ManagementObjectSearcher(objectQuery);
            string macAdd = "";
            foreach (System.Management.ManagementObject nicObj in searcher.Get())
            {
                macAdd = nicObj["MACAddress"].ToString();
                MessageBox.Show(macAdd);
            }
        }

        public void GetMacAddress2()
        {
            string queryString = "SELECT * FROM Win32_NetworkAdapterConfiguration WHERE IPEnabled= 'TRUE'";

            System.Management.ManagementObjectSearcher query = new System.Management.ManagementObjectSearcher(queryString);
            System.Management.ManagementObjectCollection queryCol = query.Get();
            foreach (System.Management.ManagementObject mo in queryCol)
            {
                string[] address = (string[])mo["IPAddress"];
                string[] subnets = (string[])mo["IPSubnet"];
            }
        }

private String GetMACAddress()
        {
            String strMACAddress = String.Empty;

            if (GetNetConnectionStatus())
            {
                ObjectQuery objQuery = new ObjectQuery("SELECT NetConnectionStatus, MacAddress FROM Win32_NetworkAdapter");
                ManagementObjectSearcher mobjSearcher = new ManagementObjectSearcher(objQuery);

                try
                {
                    foreach (ManagementObject obj in mobjSearcher.Get())
                    {
                        if (obj["NetConnectionStatus"] != null)
                        {
                            if (Convert.ToInt32(obj["NetConnectionStatus"].ToString()) == 2)
                            {
                                strMACAddress = obj["MACAddress"].ToString();
                                break;
                            }
                        }
                    }
                }
                catch (Exception e)
                {
                    MessageBox.Show(e.Message);
                    strMACAddress = String.Empty;
                }
            }

            return strMACAddress;
        }