title: How to delete all files with .mp3 extension?
body: <p>I have an external hard disk drive for data backup purpose. Now I want to delete all mp3 files in that drive. How do I do it?</p>
  
  <p>NOTE: The mp3 files are contained within many nested folders. For example, <code>K:\(artist name)\(album name)\</code>mp3 files</p>
  
  <p>Update: I tried using <code>system.io.directory.getallfiles()</code>, but my mp3 files are contained in many many folders. My current approach is not working</p>
  
  <p>Update: I want to create a utility application (in winform) that can delete specific file extension, i.e. <code>.mp3</code></p>