using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public class A

    {

        public A()

        {

            First = new List<int>() { 1, 2, 3 };

            Second = new List<int>() { 4, 5, 6 };

​

            All = new List<IList<int>>() { First, Second };

        }

​

        public List<IList<int>> All { get; private set; }

​

        public IList<int> First { get; set; }

​

        public IList<int> Second { get; set; }

    }

    static void Main(string[] args)

    {

        var tmp = new A();

        var l = tmp.Second; 

        tmp.Second =  new List<int>(tmp.Second.Reverse());

        PrintList(l);

        PrintList(tmp.Second);

    }

​

    private static void PrintList<T>(IList<T> list)

    {

        foreach (var el in list)

        {

            Console.WriteLine(el);

        }

​

        Console.WriteLine("__________");

    }

}