title: How can I make a simple test to verify that Visual Studio 2015 in Design Mode is executing my code?
body: <p>Working on a Visual Studio 2015 Windows Phone 8.1 app (Developing on Windows 10!), how can I make a simple test to verify that Visual Studio in Design Mode is executing my code?</p>
  
  <p>I tried to put </p>
  
  <pre><code>Debug.WriteLine("DesignMode executing test");
  </code></pre>
  
  <p>in the constructor of a page, but when I load it in Design Viewer, nothing happens. I think the test I made isn't clever.</p>