Make overlapping picturebox transparent in C#.net

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Clearly you are using Winforms. Yes, transparency is simulated by drawing the pixels of the Parent. Which is the form, you only see the form pixels, stacking effects don’t work. There’s a KB article that shows a workaround for this. It is painful. Another approach is to not use PictureBox controls but just draw the images in the form’s Paint event.

Consider WPF, it has a very different rendering model that easily supports transparency.

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