c# - A Program that have 20 questions and asks 5 of them randomly

Question

As a school project my task is writing a c# code that asks 5 different randomly choosen questions out of 20 questions that i set before (not math questions they are strings)

But i couldnt find a way to do it without using 20 switch cases which im not allowed to do

can anybody give me some tips i really need some help

Answer 1

Put the 20 questions in a list or similar data structure.

Choose an index (between 0 and "list length") at random. Take the question at that list index, remove question from list.

Repeat (with the now smaller list) until you have 5 questions.