title: FileSystemWatcher specific files with filename keywords filter
body: <p>I am using below code for watching files on local system using FileSystemWatcher class. What I would like to do is watch only those filename which I specify in keywords (could be a comma separated string or txt file).
  Please guide me in the right direction.</p>
  
  <pre><code>   FileSystemWatcher objWatcher = new FileSystemWatcher(); 
     objWatcher.Filter = "*.*"; 
     objWatcher.Changed += new FileSystemEventHandler(OnChanged); 
  
     private static void OnChanged(object source, FileSystemEventArgs e) 
     { 
       string strFileExt = getFileExt(e.FullPath); 
     } 
  </code></pre>
  
  <p><strong><em>Thanks &amp; Regards</em></strong></p>