title: How can I set a form to have a transparent background in c#?
body: <p>I want to set my form's background to transparent but faced an error "property value is not valid". I don't know if there is a simple way to set a transparent background image as a form in windows?</p>
  
  <p>I'm trying to make a c# windows form application.</p>
  
  <p>I cannot upload a picture yet.For example I want to run my app and see a picture of a book (that doesn't have any white background borders)including tools</p>