get_unique_id

public static string GetDeviceUniqueIdentifier()
        {
            string ret = string.Empty;

            string concatStr = string.Empty;
            try
            {
                ManagementObjectSearcher searcherBb = new ManagementObjectSearcher("SELECT * FROM Win32_BaseBoard");
                foreach (var obj in searcherBb.Get())
                {
                    concatStr += (string)obj.Properties["SerialNumber"].Value ?? string.Empty;
                }

                ManagementObjectSearcher searcherBios = new ManagementObjectSearcher("SELECT * FROM Win32_BIOS");
                foreach (var obj in searcherBios.Get())
                {
                    concatStr += (string)obj.Properties["SerialNumber"].Value ?? string.Empty;
                }

                ManagementObjectSearcher searcherOs = new ManagementObjectSearcher("SELECT * FROM Win32_OperatingSystem");
                foreach (var obj in searcherOs.Get())
                {
                    concatStr += (string)obj.Properties["SerialNumber"].Value ?? string.Empty;
                }

                var sha1 = SHA1.Create();
                ret = string.Join("", sha1.ComputeHash(Encoding.UTF8.GetBytes(concatStr)).Select(b => b.ToString("x2")));
            }
            catch (Exception e)
            {
                Console.WriteLine(e.ToString());
            }

            return ret;
        }