using System;

using System.IO;

using System.Text;

using System.Linq;

​

public class Program

{

    public void Main()

    {

        PartOfAFileViewer file = new PartOfAFileViewer(new MemoryStream(Enumerable.Range(0, 255).Select(x => (byte)x).ToArray()));

        byte[] data = new byte[128];

        file.GetSection(data, 23, data.Length);

        Console.Write(ToBinary(data));

    }

​

    public string ToBinary(byte value)

    {

        string result = "";

        for (int i = 0; i < 8; i++)

        {

            result = value % 2 + result;

            value /= 2;

        }

​

        return result;

    }

​

    private string ToBinary(byte[] values)

    {

        StringBuilder builder = new StringBuilder();

        int column = 0;

        foreach (byte value in values)

        {

            builder.Append(ToBinary(value) + " ");

            column++;

            if (column == 8)

            {

                builder.AppendLine();

                column = 0;

            }

        }

​

        return builder.ToString();

    }

}

​

public class PartOfAFileViewer

{

    private readonly Stream _stream;

    private readonly long _length;

    public static PartOfAFileViewer FromFile(string filename)

    {

        return new PartOfAFileViewer(new FileStream(filename, FileMode.Open, FileAccess.Read));

    }

​

    public PartOfAFileViewer(Stream stream)

    {

        if (!stream.CanSeek)

            throw new ArgumentException(@"Stream must be able to seek!", "stream");

        _length = stream.Length;

        _stream = stream;

    }

​

    public void GetSection(byte[] buffer, long position, int length)

    {

        if (position > _length)

            throw new IndexOutOfRangeException();

        if (position + length > _length)

            length = (int)(_length - position);

        _stream.Seek(position, SeekOrigin.Begin);

        _stream.Read(buffer, 0, length);

    }

}