title: TransparencyKey Property on Forms
body: <p>I would like to swith my form background transparency with Visual C# in a Windows Forms Application.</p>
  
  <p>I used </p>
  
  <pre><code>BackColor = Color.White;
  TransparencyKey = Color.White;
  </code></pre>
  
  <p>Now I want to switch back to "not transparent". How can I accomplish that? Just switching the BackColor makes the elements on the form look strange and it feels ugly.
  I guess there is a way to reset the property.</p>