private string GetSHA1HashData(string data)
    {
        SHA1 sha1 = SHA1.Create();

        byte[] hashData = sha1.ComputeHash(Encoding.Default.GetBytes(data));

        StringBuilder returnValue = new StringBuilder();

        for (int i = 0; i < hashData.Length; i++)
        {
            returnValue.Append(hashData[i].ToString());
        }

        return returnValue.ToString();
    }

    private string GetMacAddress()
    {
        string macAddresses = string.Empty;

        foreach (NetworkInterface nic in NetworkInterface.GetAllNetworkInterfaces())
        {
            if (nic.OperationalStatus == OperationalStatus.Up)
            {
                macAddresses += nic.GetPhysicalAddress().ToString();
                break;
            }
        }

        return macAddresses;
    }