Cannot Watch Folder using FileSystemWatcher in C#

I am attempting to monitor a folder (and its sub-folders) for changes. However, my handler event is neve开发者_运维技巧r executed. I am using the following code:

FileSystemWatcher m_Watcher = new FileSystemWatcher();
m_Watcher.Path = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) + "/Portal 2 Map Installer/"; 
m_Watcher.Filter = "";
m_Watcher.NotifyFilter = NotifyFilters.LastAccess |
             NotifyFilters.LastWrite |
             NotifyFilters.FileName |
             NotifyFilters.DirectoryName;
m_Watcher.IncludeSubdirectories = true;
m_Watcher.Changed += new FileSystemEventHandler(OnFolderChange);
m_Watcher.EnableRaisingEvents = true;

Help please!

Create a handler for the on error event and see what it says:

  m_Watcher.Error += new ErrorEventHandler(OnError);

There are some notes on the Changed event handler :

The Changed event is raised unexpectedly when a file is renamed, but is not raised when a directory is renamed. To watch for renaming, use the Renamed event.

So it would be prudent to handle the Renamed event as well (at the least).