Generating random, unique values C#

Question

I\'ve searched for a while and been struggling to find this, I\'m trying to generate several random, unique numbers is C#. I\'m using System.Random, and I\'m us

Answer 1

And here my version of finding N random unique numbers using HashSet. Looks pretty simple, since HashSet can contain only different items. It's interesting - would it be faster then using List or Shuffler?

using System;
using System.Collections.Generic;

namespace ConsoleApplication1
{
    class RnDHash
    {
        static void Main()
        {
            HashSet rndIndexes = new HashSet();
            Random rng = new Random();
            int maxNumber;
            Console.Write("Please input Max number: ");
            maxNumber = int.Parse(Console.ReadLine());
            int iter = 0;
            while (rndIndexes.Count != maxNumber)
            {
                int index = rng.Next(maxNumber);
                rndIndexes.Add(index);
                iter++;
            }
            Console.WriteLine("Random numbers were found in {0} iterations: ", iter);
            foreach (int num in rndIndexes)
            {
                Console.WriteLine(num);
            }
            Console.ReadKey();
        }
    }
}