title: Make the form's background to transparent
body: <p>I made a borderless form and I set my background image (in PNG format) to something like the one shown in the image below. What I want is to make the form's background transparent so that only the circular image is shown. I tried changing the form's <code>BackColor</code> to <code>Transparent</code> but I'm getting an error saying <code>Property value is not vald</code></p>
  
  <p><img src="https://i.stack.imgur.com/Whmgf.jpg" alt="image"></p>