title: I'm trying to get App.Config properties, but they returned null
body: <p>I've got a Solution which have 6 another projects, and I'm trying to acces the App.config from a non main project and get some properties, but it returns null. Not happy, I tried to get a property from the main project's App.config, and still null.</p>
  
  <p>I've tried to use two ways to get the App.config properties:</p>
  
  <pre><code>var a = ConfigurationManager.AppSettings.Get("cdEntidadeSistemaIND");
  var b = ConfigurationManager.AppSettings["cdEntidadeSistemaIND"];
  </code></pre>