Switch statement: Random generator

I want to make a quiz with a switch-case statement. Before entering it I generate a random number between 1 and for example 10. Then there are 10 cases, one for each number. In each of them there is a question, meaning, that the program displays a random question at the beginning. When the question is answered correctly i want the program to pick a random question again by generating a number but not the one who was already picked. How do i do that?