title: read only given last x lines in txt file
body: <p>Currently I'm reading file content using File.ReadAllText(), but now I need to read last x lines in my txt file. How can I do that?</p>
  
  <p>content of <code>myfile.txt</code></p>
  
  <pre><code>line1content 
  line2content
  line3content
  line4content 
  
  string contentOfLastTwoLines = ...
  </code></pre>