using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var objCollection = (ICollection<object>) new List<object>

            {

                "Good Morning",

                "Good Afternoon",

                "Good Night"

            };

        Console.WriteLine(objCollection.First() as string);

        Console.WriteLine(objCollection.Last() as string);

        Console.WriteLine(objCollection.ElementAt(1) as string);

        Console.WriteLine((objCollection.ElementAtOrDefault(99) as string) ?? "Index was out of range");

    }

}