title: Check if a folder contains a file that is a copy of a file in another folder
body: <p>I have a file:</p>
  
  <pre><code>string myFile = @"C:\Users\Nick\Desktop\myFile.txt";
  </code></pre>
  
  <p>And I want to check if there is a copy of this file in another directory:</p>
  
  <pre><code>string DestinationDir = @"C:\Users\Nick\Desktop\MyDir"
  </code></pre>
  
  <p>How can I achieve this?</p>