title: Search specific string and return whole line
body: <p>What I would like to do is find all instances of a string in a text file, then add the full lines containing the said string to an array.</p>
  
  <p>For example:</p>
  
  <pre><code>eng    GB    English
  lir    LR    Liberian Creole English
  mao    NZ    Maori
  </code></pre>
  
  <p>Searching eng, for example, must add the first two lines to the array, including of course the many more instances of 'eng' in the file.</p>
  
  <p>How can this be done, using a text file input and C#?</p>