File Directory Stream C# Tutorial

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
    class Program
    {
        static void Main(string[] args)
        {
            byte[] byData = new byte[200];
            char[] charData = new Char[200];
            FileStream aFile = new FileStream("Program.cs", FileMode.Open);
            aFile.Seek(113, SeekOrigin.Begin);
            aFile.Read(byData, 0, 200);
            Decoder d = Encoding.UTF8.GetDecoder();
            d.GetChars(byData, 0, byData.Length, charData, 0);
            Console.WriteLine(charData);
        }
    }