title: What is the opposite method of Any<T>
body: <p>How can I check with Linq if a collection does not contain an object. I.E. The opposite of <code>Any&lt;T&gt;</code>.</p>
  
  <p>I could invert the result with a <code>!</code> but for readability I wondered if there was a more better way to do this? Should I add the extension myself?</p>