List<int> source = new List<int> { 3, 2, 1, 4, 5 };
IOrderedEnumerable<int> sourceOrdered = source.OrderBy(x => x);
source.ToList()[1] = 6;

using System;
using System.Collections.Generic;

namespace SortedList
{
    class Program
    {
        static void Main(string[] args)
        {
            var source = new List<int> { 3, 2, 1, 4, 5 };

            source.Sort();
            source[1] = 6;

            Console.WriteLine("Count = {0}", source.Count);

            for (int i = 0; i < source.Count; i++)
            {
                Console.WriteLine("    [{0}]: {1}", i, source[i]);
            }

            Console.ReadKey();
        }
    }
}