This class allows you to listen to the filesystem and respond to different operations on it. To register a watch on files or directories, first set Path to the path you wish to watch. Next, set the Filter property. If you want to respond to all file changes, set it to an empty ("") string. To watch an individual file, set Filter to the filename. You can also use wildcards (such as *) in the filename. You must then also set NotifyFilter to register the types of events you wish to be notified of. If you want to monitor the subdirectories as well, set IncludeSubdirectories. EnableRaisingEvents allows you to enable or disable the FileSystemWatcher. The watcher then exposes the following events: Changed, Created, Deleted, Disposed, Error, and Renamed. An Error is raised if too many events occur on a filesystem for the watcher to correctly monitor it.

public class FileSystemWatcher : System.ComponentModel.Component, System.ComponentModel.ISupportInitialize {
// Public Constructors
   public FileSystemWatcher( );
   public FileSystemWatcher(string path);
   public FileSystemWatcher(string path, string filter);
// Public Instance Properties
   public bool EnableRaisingEvents{set; get; }
   public string Filter{set; get; }
   public bool IncludeSubdirectories{set; get; }
   public int InternalBufferSize{set; get; }
   public NotifyFilters NotifyFilter{set; get; }
   public string Path{set; get; }
   public override ISite Site{set; get; }
// overrides System.ComponentModel.Component
   public ISynchronizeInvoke SynchronizingObject{set; get; }
// Public Instance Methods
   public void BeginInit( );
// implements System.ComponentModel.ISupportInitialize
   public void EndInit( ); 
// implements System.ComponentModel.ISupportInitialize
   public WaitForChangedResult WaitForChanged(WatcherChangeTypes changeType);
   public WaitForChangedResult WaitForChanged(WatcherChangeTypes changeType, int timeout);
// Protected Instance Methods
   protected override void Dispose(bool disposing);  
// overrides System.ComponentModel.Component
   protected void OnChanged(FileSystemEventArgs e);
   protected void OnCreated(FileSystemEventArgs e);
   protected void OnDeleted(FileSystemEventArgs e);
   protected void OnError(ErrorEventArgs e);
   protected void OnRenamed(RenamedEventArgs e);
// Events
   public event FileSystemEventHandler Changed;
   public event FileSystemEventHandler Created;
   public event FileSystemEventHandler Deleted;
   public event ErrorEventHandler Error;
   public event RenamedEventHandler Renamed;
}

Hierarchy

System.Object System.MarshalByRefObject System.ComponentModel.Component(System.ComponentModel.IComponent, System.IDisposable) FileSystemWatcher(System.ComponentModel.ISupportInitialize)