How can I show a grey transparent overlay in C#? -

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how can show grey transparent overlay in c#?
should overlay other process not owned application doing overlay.

create transparent window size of whole screen, mark always-on-top, calculate regions of other application windows, , make non-window regions of top window grey.

i suppose position own application windows on top of transparent grey one, being above other ones, getting tricky z-order scenario right, in conjunction other apps might doing z-order tricks, tough.


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