I'm making a Windows application, which you need to log into first.
The account details consist of username and password, and they need to be saved locally.
It's just a matter of security, so other people using the same computer can't see everyone's personal data.
What is the best/most secure way to save this data?

I don't want to use a database, so I tried some things with Resource files.
But since I'm kind of new with this, I'm not entirely sure of what I'm doing and where I should be looking for a solution.