using System;

using System.Collections.Generic;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        string aString = "040204220442040004200404020602260246";

​

        if ((aString.Length % 2) != 0)

        {

            // Handle invalid input

        }

        var bytes = new byte[aString.Length / 2];

​

        int index = 0;

        for (int i = 0; i < aString.Length; i += 2)

        {

            string digits = aString.Substring(i, 2);

            byte aByte = (byte)int.Parse(digits, NumberStyles.HexNumber);

            bytes[index++] = aByte;

        }

        foreach (byte aByte in bytes)

        {

            Console.WriteLine(aByte);

        }

    }

}