c# WinForms: Make part of the Form transparent -

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I have form1 in which the background message is accompanied by an error message and some buttons and then Shows when some error occurs. I have to make a part of the Form1 transparent, while the other part will contain an error message and it will be nonresprontent. Here's some illustration.

Enter image details here

Gray form 1 should be part of , 80% transparent how can I get it?

So far, I have tried to play with opacity , but it makes the whole frame transparent. Please help me with this. I really need to make it today, thanks a lot.

set back coral and transparency same color

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