c# - Controls doesn't show if heavy process -

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i use c# in winform.

before heavy function, want show waiting form prevent user. form opens, controls in not drawn.

in following code, waitingform little form, textbox , progressbar

using (waitingform waitingform = new waintingform()) {   waitingform.show();   heavyfunction(); }

i see 2 white rectangles, controls should appear. why happens ?

you can't show waiting form before heavy processing , expect ui remain responsive. thread you're clogging heavyfunction() same 1 responsible drawing forms, controls , maintaining ui. use backgroundworker or threadpool offload heavy processing thread.

edit: also, please consider ron beyer's input regarding async/await


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