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Async File Stream

using System; using System.Collections.Generic; using System.Text; using System.Threading; using System.IO; class Program {     static void Main(string[] args) {         Console.WriteLine("Main thread started. ThreadID = {0}", Thread.CurrentThread.GetHashCode());         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) {         Console.WriteLine("AsyncCallback method on ThreadID = {0}", Thread.CurrentThread.GetHashCode());         Stream s = (Stream)ar.AsyncState;         s.EndWrite(ar);         s.Close();     } }