File Stream C#

using System;
using System.IO;
public class Program {
    static void Main(string[] args) {
        FileSystemWatcher watcher = new FileSystemWatcher();
        try {
            watcher.Path = @"C:\MyFolder";
        } catch (ArgumentException ex) {
            Console.WriteLine(ex.Message);
            return;
        }
        watcher.NotifyFilter = NotifyFilters.LastAccess
            | NotifyFilters.LastWrite
            | NotifyFilters.FileName
            | NotifyFilters.DirectoryName;
        watcher.Filter = "*.txt";
        watcher.Changed += new FileSystemEventHandler(OnChanged);
        watcher.Created += new FileSystemEventHandler(OnChanged);
        watcher.Deleted += new FileSystemEventHandler(OnChanged);
        watcher.Renamed += new RenamedEventHandler(OnRenamed);
        watcher.EnableRaisingEvents = true;
        Console.WriteLine(@"Press 'q' to quit app.");
        while (Console.Read() != 'q') ;
    }
    private static void OnChanged(object source, FileSystemEventArgs e) {
        Console.WriteLine("File: {0} {1}!", e.FullPath, e.ChangeType);
    }
    private static void OnRenamed(object source, RenamedEventArgs e) {
        Console.WriteLine("File: {0} renamed to\n{1}", e.OldFullPath, e.FullPath);
    }
}