Question

I would like to know how to achieve this task in C#. For example;

I got 10 questions from which 3 is to be displayed to user for them to
type the answer. How can i make the program generate 3 questions that
are non-repeating(unique) assuming the 10 questions that we are
starting with is unique.

I am using the logic in a asp.net application, and the same set of questions are allowed to be displayed the next time page is refreshed, so that’s no problem for me.

Answer 1

Use a List for your Question instances, and select one at random (by index). Then remove it from the List and repeat. Something like so;

    static void Main(string[] args)
    {
        List<string> questions = new List<string>();
        for (int i = 0; i < 10; i++)
            questions.Add("Question " + i);

        Random r = new Random();
        for (int i = 0; i < 3; i++)
        {
            int nextQuestion = r.Next(0, questions.Count);
            Console.WriteLine(questions[nextQuestion]);
            questions.RemoveAt(nextQuestion);
        }
    }