Write it. Run it. Keep it.
A free account saves what you write, so you can pick it up on any device.
Free to use, nothing to sign up for
Online code editor
Write C#, feed it input and run it, with the tests if a task has them.
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Teaching a class? The same editor, with tests, hand-ins and marking, is the Learning Platform, free to try.
How it works, in the manual: Running a class with nothing installed.