process_bytearray_block-by-block, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            
            byte[] data = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21};
            
            int buffer_size = 4;
            
            for(int block_num=0; (block_num * buffer_size)<=data.Length; block_num++){
                int buffer_length = (
                            ( ( data.Length - ( block_num * buffer_size ) ) >= buffer_size )
                                ? buffer_size
                                : ( data.Length - ( block_num * buffer_size ) )
						)
				;
								
                byte[] block = new byte[buffer_length];
                
                block = data.Skip((block_num * buffer_size)).Take(buffer_length).ToArray();                
                
                //Buffer.BlockCopy is faster than Array.Copy for byte arrays.
                //Buffer.BlockCopy(data, (block_num * buffer_size), block, 0, buffer_length);
            
                //stream.Write(block, 0, block.Length);
                //    but show block:
                Console.WriteLine("\nblock_num: "+block_num);
                for(int i = 0; i<block.Length; i++){
                    Console.WriteLine("block["+i+"]: "+block[i]);
                }
            }
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,16 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 14 Mb, average nr of threads: 3, absolute service time: 0,3 sec