Window form shaped corners

Im trying to create a borderless forms (.n开发者_开发知识库et 2 winforms) with smooth rounded corners. nothing works anti alias, API, different image formats and transparency. rounded corners will not look smooth.

does anyone have any suggestions? thank you

I have found a solution @

http://www.codeproject.com/KB/dialog/SemiTranDlgWithCtrls.aspx

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This question might yield some answers:

C# transparent border for borderless form

Off-hand I know that WinForms and transparency are not the best of friends.