winforms - semi-transparent form but opaque Controls in C# -

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how make semi transparent form in c# windows form application

i have tried transparentkey makes full-transparent. , tried opacity effects whole form (with controls).

i want form part semi-transparent not controls.

you can use hatch brush percentage, example:

    using system.drawing.drawing2d;      private void form1_paint(object sender, painteventargs e)     {         var hb = new hatchbrush(hatchstyle.percent50, this.transparencykey);          e.graphics.fillrectangle(hb,this.displayrectangle);     }

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