using System;

using System.IO;

public class Program

{

    public static void Main()

    {

        byte[] source = new byte[] { 0, 1, 2, 3 };

        MemoryStream stream = new MemoryStream(source);

        // If the constructor made a copy, the stream won't be affected and it will output 0 below.

        source[0] = 10;

        byte b = (byte)stream.ReadByte();

        Console.WriteLine(b);

    }

}