I have a idea for designed window in winform. like below. I try the window opacity propriety.
But the Image also not visible. How to make this in winform.

I found this image in google. Thanks.
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Try using the Form.TransparencyKey property
Make sure the background of the picture you use have the a certain color and set this color as the TransparencyKey.
You should also set the FormBorderStyle property to FormBorderStyle.None in order hide the form’s title, border, etc: