using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        List<int> list = Enumerable.Range( 0, 6 ).ToList();

        list.Shuffle();

        int a = list[0];

        int b = list[1];

        int c = list[2];

        Console.WriteLine( a );

        Console.WriteLine( b );

        Console.WriteLine( c );

    }

}

​

public static class ListShuffler

    {

        private static Random rng = new Random();

        public static void Shuffle<T>(this IList<T> list)

        {

            int n = list.Count;

            while (n > 1)

            {

                n--;

                int k = rng.Next(n + 1);

                T value = list[k];

                list[k] = list[n];

                list[n] = value;

            }

        }

    }

​