C # how to monitor the folder is deleted ?

Is the folder is deleted, not the file under the folder . Thank
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refer: http://www.codeproject.com/Articles/11140/DirectoryWatcher
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judge this folder exists ? was deleted does not exist

public static bool IsExistsFilePath(string folder)
  {
      if (!System.IO.Directory.Exists(folder))
      {
          return false;
      }
      return true;
  }

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string path = @"C:\Users\MyFolder\FileWatch"; // watch for parent directory
  if (!Directory.Exists(path)) // verify it exists before start
      return;
  
  FileSystemWatcher watcher = new FileSystemWatcher(path);
  // set option to track directories only
  watcher.NotifyFilter = NotifyFilters.DirectoryName;
  
  watcher.Deleted += (o, e) =>
  {
      if (e.FullPath == @"C:\Users\MyFolder\FileWatch\Test")
      {
          // If you are here, your test directory was deleted
      }
  };
  
  watcher.EnableRaisingEvents = true;