How To Get Windows Product Key In C#

I wrote a tutorial before months on how to get windows product key in vb.net. Today we are going to do the same thing in c#.

First of all add these namespaces :

using Microsoft.Win32;
using System.Collections;

After that add this function.:

 public enum Key { Windows };
        public static byte[] GetRegistryDigitalProductId(Key key)
        {
            byte[] digitalProductId = null;
            RegistryKey registry = null;
            switch (key)
            {
                case Key.Windows:
                    registry =
                      Registry.LocalMachine.
                        OpenSubKey(
                          @"SOFTWARE\Microsoft\Windows NT\CurrentVersion",
                            false);
                    break;
            }
            if (registry != null)
            {
                digitalProductId = registry.GetValue("DigitalProductId")
                  as byte[];
                registry.Close();
            }
            return digitalProductId;
        }
        public static string DecodeProductKey(byte[] digitalProductId)
        {
            const int keyStartIndex = 52;
            const int keyEndIndex = keyStartIndex + 15;
            char[] digits = new char[]
      {
        'B', 'C', 'D', 'F', 'G', 'H', 'J', 'K', 'M', 'P', 'Q', 'R', 
        'T', 'V', 'W', 'X', 'Y', '2', '3', '4', '6', '7', '8', '9',
      };
            const int decodeLength = 29;
            const int decodeStringLength = 15;
            char[] decodedChars = new char[decodeLength];
             ArrayList hexPid = new ArrayList();
            for (int i = keyStartIndex; i <= keyEndIndex; i++)
            {
                hexPid.Add(digitalProductId[i]);
            }
            for (int i = decodeLength - 1; i >= 0; i--)
            {
                if ((i + 1) % 6 == 0)
                {
                    decodedChars[i] = '-';
                }
                else
                {
                     int digitMapIndex = 0;
                    for (int j = decodeStringLength - 1; j >= 0; j--)
                    {
                        int byteValue = (digitMapIndex << 8) | (byte)hexPid[j];
                        hexPid[j] = (byte)(byteValue / 24);
                        digitMapIndex = byteValue % 24;
                        decodedChars[i] = digits[digitMapIndex];
                    }
                }
            }
            return new string(decodedChars);
        }

I always love to get the result via messagebox so add this piece of code to form_load or something

            byte[] results = Form1.GetRegistryDigitalProductId(Form1.Key.Windows);

            MessageBox.Show(Form1.DecodeProductKey(results),"HWID()",MessageBoxButtons.OK,MessageBoxIcon.Information);

Debug and there you get the product key

have fun :)