title: Directory.GetFiles() but only include files with a specific content (for e.g. "my file contents") using C#
body: <p>I want to search all XML files which contains a special tag, e.g. 'field' within their contents. How can I achieve this with <code>Directory.GetFiles(...)</code> method in C# ?</p>
  
  <pre><code>string[] filePathsFields = Directory.GetFiles(@"E:\Code\", "*.xml", SearchOption.AllDirectories);
  </code></pre>