title: How to check if a Dictionary contains a given value?
body: <p>How do I check if a value exists in a <code>Dictionary(Of int, String)</code>?</p>
  
  <p>Let’s say I have <code>[{1, 'One'};{2, 'Two'};{3, 'Three'}]</code>, how to check if ‘Two’ exists ?</p>