Aurora Service Password Keygen - BuyItFixIt (YouTube)

using System;
using System.Text;
using System.Windows.Forms;

//Aurora Inverter Service Keygen - Buy It Fix It (YouTube)
namespace aurora_service_keygen
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void BtnGenerate_Click(object sender, EventArgs e)
        {
            int parsedValue;
            if ((TxbSerialNumber.Text.Length !=6) || (!int.TryParse(TxbSerialNumber.Text, out parsedValue)))
            {
                MessageBox.Show("Enter 6 digit serial number - digits only!");
                return;
            }

            MessageBox.Show("Service Password:" + GenerateServicePassword(TxbSerialNumber.Text));
        }

        private string GenerateServicePassword(string SerialNumber)
        {
            byte[] result = new byte[6];
            string seed = "919510";
            for (int index = 0; index < 6; index++)
            {
                byte b = (byte)(SerialNumber[index] - '0');
                byte c = (byte)(seed[index] - '0');
                if (index % 2 == 0)
                {
                    result[index] = (byte)((((uint)b + (uint)c) % 10) + '0');
                }
                else
                {
                    result[index] = (byte)((((uint)b - (uint)c) % 10) + '0');
                }
            }
            return Encoding.UTF8.GetString(result);
        }

    }
}