C# WinForm how to check key state?

Question

C++ / C#

an infinite loop is needed
where the check of the state of the keys will take place (actually the question is how?)
calculation of mathematics
output to the form (refresh)

googled until I found nothing except KeyDown, KeyPress, KeyUp.

Answer 1

Apparently so
https://docs.microsoft.com/en-us/windows/win32/api...
but what prevents catching KeyDown???