title: How to throw an underflow exception?
body: <p>In C# I can throw an overflow exception:</p>
  
  <pre><code>throw new System.OverflowException("Cannot push onto a full stack.");
  </code></pre>
  
  <p>How do I throw an underflow exception?</p>
  
  <pre><code>throw new System.UnderflowException("Cannot pop from an empty stack.");
  </code></pre>
  
  <p>It doesn't look like <code>UnderflowException</code> is a method of <code>System</code>.</p>