title: Empty HashSet - Count vs Any
body: <p>I am only interested to know whether a HashSet <code>hs</code> is empty or not. 
  I am NOT interested to know exactly how many elements it contains.</p>
  
  <p>So I could use this:</p>
  
  <pre><code>bool isEmpty = (hs.Count == 0);
  </code></pre>
  
  <p>...or this:</p>
  
  <pre><code>bool isEmpty = hs.Any(x=&gt;true);
  </code></pre>
  
  <p>Which one provides better results, performance-wise(specially when the HashSet contains a large number of elements) ? </p>