title: How to make windows form in c# without rounded corners
body: <p>I want to make a windows form without rounded corners as below image. Are there any Windows API functions or any other methods to make it?</p>
  
  <p><img src="https://i.stack.imgur.com/D2d37.png" alt="No rounded corners"></p>
  
  <p>I don't want to use <code>IMAGES</code> OR <code>FormBorderStyle = none</code> Properties.</p>
  
  <p>WHEN REMOVE ROUNDED CORNERS,WINDOWS THEME COLOR SHOULD BE APPLY CORRECTLY.IT IS NOT BE WINDOWS CLASSIC MODE WINDOWS FORM</p>