private void button3_Click(object sender, EventArgs e) { string SerialNow = "CZZ0Z"; int i = 0; while (i < 3000) { SerialNow = AlphaSequence(SerialNow); i++; } } public string AlphaSequence(string input) { string alphabet = "0123456789ABCDEFGHJKLMNPQRSTUVWXYZ"; char[] sequence = input.ToCharArray(); for (int i = sequence.Length - 1; i >= 0; i--) { char currentChar = sequence[i]; if (currentChar == alphabet[alphabet.Length - 1]) { sequence[i] = alphabet[0]; } else { int index = alphabet.IndexOf(currentChar); sequence[i] = alphabet[index + 1]; break; } } return new string(sequenc