C # not a rectangular window, library?

Question

I know that you can make a non-rectangular window in C #. but I know a lot of programs, such as windows mediaplayer and other software that got a nice arrangement at the corners, etc., but when I draw a circle or something like indirect. The window system does not know what to do with pixels: S. Is there a good way to make beautiful windows for C #, or a library or something else?

Thnx!

Answer 1

From Windows WPF Overview :

"Non-rectangular window style

, , WindowStyle , . , , , Microsoft Windows Media Player.

, , .

, WindowStyle None , Window .

<Window 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    WindowStyle="None"
    AllowsTransparency="True"
    Background="Transparent">
...

</Window>

, . ( "", "", "" "" ) ..). , . "

, winforms.