title: string.IsNullOrEmpty() vs string.NotNullOrEmpty()
body: <p>I'm curious if any developers use string.IsNullOrEmpty() more often with a negative than with a positive</p>
  
  <p>e.g.</p>
  
  <pre><code>if (!string.IsNullOrEmpty())
  </code></pre>
  
  <p>This is how I use the method 99% of the time. What was the design decision for this?</p>