Hello. I'm new to windows form so I don't really understand how things work. Recently, I try to make a countdown timer that counts from a certain time to 0. But when the form is closed, everything is like "reset" and I don't want that. What I want is, for example, countdown time is 5 mins -> close form -> open form after 3 mins -> countdown time is 2 mins left. I wonder if you guys can share any ideas that will make it works and are simple so I can understand . Thanks in advance!