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Asynchronous IO with AsyncCallback

using System; using System.Collections.Generic; using System.IO; using System.Text;    public class MainClass    {       static Stream inputStream;       static AsyncCallback myCallBack;       static byte[] buffer;       static int BufferSize = 256;       public static void Main()       {          inputStream = File.OpenRead("AskTim.txt" );          buffer = new byte[BufferSize];          myCallBack = new AsyncCallback( OnCompletedRead );          inputStream.BeginRead(             buffer,             // holds the results             0,                  // offset             buffer.Length,      // (BufferSize)             myCallBack,         // call back delegate             null );             // local state object       }       static void OnCompletedRead( IAsyncResult asyncResult )       {          int bytesRead = inputStream.EndRead( asyncResult );          if ( bytesRead > 0 ){             String s = Encoding.ASCII.GetString( buffer, 0, bytesRead );             Console.WriteLine( s );             inputStream.BeginRead(buffer, 0, buffer.Length, myCallBack, null );          }       }    }