title: How to close MDI Child form C#
body: <p>How do you close a MDI Child form within that child MDI form using a <code>RETURN</code> button which will bring me back to the Parent Form? So far i have used the code: </p>
  
  <pre><code>if (ActiveMdiChild != null)                 
              ActiveMdiChild.Close(); 
  </code></pre>
  
  <p>But this doesn't work. I have tried numerous methods but nothing has worked so far
  Any help is much appreciated!!</p>