private List<XElement> identifier(string wmiClass, string wmiProperty, string name)
        {
            List<XElement> XL = new List<XElement>();
            System.Management.ManagementClass mc = new System.Management.ManagementClass(wmiClass);
            System.Management.ManagementObjectCollection moc = mc.GetInstances();
            foreach (System.Management.ManagementObject mo in moc)
            {
                if (mo != null && mo[wmiProperty] != null)
                {
                    XL.Add(new XElement(name, new XElement(wmiProperty, mo[wmiProperty])));

                }
            }
            return XL;
        }

  //cpu Identifier
        public List<XElement> GetCPUInfo()
        {

            return identifier("Win32_Processor", "ProcessorId", "CPU");  //ProcessorID

        }

        //BIOS Identifier
        public List<XElement> GetBIOSInfo()
        {
            return identifier("Win32_BIOS", "SerialNumber", "BIOS");
        }
        //Main physical hard drive ID
        public List<XElement> GetDiskInfo()
        {
            return identifier("Win32_DiskDrive", "Signature", "DISK");
        }
        //Motherboard ID
        public List<XElement> GetMotherboardInfo()
        {
            return identifier("Win32_BaseBoard", "SerialNumber", "Motherboard");
        }
        //Primary video controller ID
        //public static string GetVideoInfo()
        //{
        //    return "DriverVersion:" + identifier("Win32_VideoController", "DriverVersion") + ",    " +
        //    "Name:" + identifier("Win32_VideoController", "Name");
        //}
        //First enabled network card ID
        public List<XElement> GetMACId()
        {
            return identifier("Win32_NetworkAdapterConfiguration", "MACAddress", "MAC");
        }

        public List<XElement> GetUUID()
        {
            return identifier("Win32_ComputerSystemProduct", "UUID", "UniqueID");

        }