title: C#, Visual Studio 2013: Debug.WriteLine doesn't output to Output Window
body: <p>I've read through other similar questions but nothing has worked for me.  I've changed debugging settings to check this against the most common answers.</p>
  
  <p>Project Type is a class library.</p>
  
  <p>Why does this code not print anything in the output window?</p>
  
  <pre><code>public class API 
      {
          public void  BrowseDirectory() {
              string[] allFiles = Directory.GetFiles(@"C:\", "*", SearchOption.AllDirectories);
  
              System.Diagnostics.Debug.WriteLine(allFiles);
  
          }
  
      }
  </code></pre>