Using radio buttons to collect answers in C sharp, how can this be done?

My current situation: I am writing a csharp quiz, in forms (Visual Studio).

It is a multiple choice quiz, with the question followed by 3 choices, as radio buttons.

My question: How do I get an answer from a radio button, and then how can I convert all of the answers to provide the user with a correct answers %?

I need to hard code the answers and questions into the program, and cannot use databases. I'm basically at the wall of my limited knowledge (noob).