Easy control transparency isn’t exactly a hallmark of Windows Forms. If you have a form with a background image or a gradient, the stock controls paint with a solid background to give a criminally egregious aesthetic.

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There are lots of examples that demonstrate how to draw a rectangle with rounded corners using GDI+ in .NET. Converting such a rectangle to a Region so that it can be filled or be used for the geometry of a window can have less than perfect results, though.
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