title: Check if object exists in a VB.NET dictionary using Primary Key
body: <p>I have a dictionary declared like this:</p>
  
  <pre><code>Dim customersDictionary As Dictionary(Of Customer, IList(Of String))
  </code></pre>
  
  <p>A Customer object is the key and for each customer object there is list of String values.</p>
  
  <p>How would I return a bool checking to see if a customer with an id of 123 exists in the dictionary?</p>