using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var list = new List<object>();

        list.Add("a");

        list.Add("b");

        list.Add("c");

        list[1] = null;

        for (int i = 0; i < list.Count; i++)

        {

            Console.WriteLine(i + " -> " + list[i]);

        }

        list.TrimExcess();

        for (int i = 0; i < list.Count; i++)

        {

            Console.WriteLine(i + " -> " + list[i]);

        }

    }

}