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

namespace SpeedSearch
{
    class Program
    {
        char[] Chars;
        byte[] Bytes;
        byte b;
        string str = "das";
        int i;

        static void Main(string[] args)
        {
            Program P = new Program();
            P.Start();
        }

        private void Start()
        {
            Chars = str.ToCharArray();
            Bytes = new byte[Chars.Length];
            for (i = 0; i < Chars.Length; i++)
            {
                Bytes[i] = Convert.ToByte(Chars[i]);
            }
            FileStream FS = new FileStream("test.txt",FileMode.Open);
            BinaryReader BR = new BinaryReader(FS);
            while ( (b = BR.ReadByte()) != 0)            // hier is das problem
            {
                if (Bytes[0].Equals(b))
                {
                    Console.WriteLine("Gefunden!");
                }
            }
            Console.Read();
        }
    }
}                    

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try
{
   ...
}
// Catch the EndOfStreamException
catch(EndOfStreamException e)
{
}