C#: is there a way to display result base on user input at the moment -

i working on unit converting project. idea develop google's converter, except in windows application form. want result show based on user's input @ moment. means if user converting 100cm m, result show 0.01m when 1 typed in , 1m completes input. there way doing it? have been searching in google of helps on java script. thanks!

you're looking keyup event.