title: How does a view know which layout to use? Where is the default?
body: <p>In default mvc app. There are Layout and content pages, You know (_Layout, Home, Contact, etc.)</p>
  
  <p>And content pages do not contain layout refrence as this:</p>
  
  <pre><code>Layout = "~/Views/Shared/_Layout.cshtml";
  </code></pre>
  
  <p>In content pages this code is missing. 
  But they works. How does it do this without layout refrence?</p>