using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var argb = Convert.FromHexString("FFFFFFFF");

        var bytes = System.BitConverter.ToInt32(new byte[] { argb[3], argb[2], argb[1], argb[0] }, 0);

        Console.WriteLine($"{argb} -> {bytes}");        

    }

}