title: How to tell "if on development environment"?
body: <p>I'd like to add a condition to my C# program i'm develop in Visual Studio: </p>
  
  <pre><code>#If onEditor 
     do something
  </code></pre>
  
  <p>In Unity exists <code>if Application.isEditor</code> </p>
  
  <p>Does exists something in 'regular' (WinForms or ASP.NET) C# application on Visual Studio?</p>