title: Test if all values in a list are unique
body: <p>I have a small list of bytes and I want to test that they're all different values.
  For instance, I have this:</p>
  
  <pre><code>List&lt;byte&gt; theList = new List&lt;byte&gt; { 1,4,3,6,1 };
  </code></pre>
  
  <p>What's the best way to check if all values are distinct or not?</p>