Async FileStream demo : Asynchronous Input Output « File Directory Stream « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. File Directory Stream
3. Asynchronous Input Output

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

  class Program
  {
    static void Main(string[] args)
    {
      FileStream fs = new FileStream("logfile.txt", FileMode.Append,FileAccess.Write, FileShare.None, 4096, true);
      string msg = "this is a test";
      byte[] buffer = Encoding.ASCII.GetBytes(msg);
      fs.BeginWrite(buffer, 0, buffer.Length,new AsyncCallback(WriteDone), fs);
    }

    private static void WriteDone(IAsyncResult ar)
    {
      Stream s = (Stream)ar.AsyncState;
      s.EndWrite(ar);
      s.Close();
    }
  }