using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Collections;  

public class Program

{

    public static void Main()

    {

        IList<int> intList = new List<int>() { 10, 21, 30, 45, 50, 87 };

        IList<string> strList = new List<string>() { "One", "Two", null, "Four", "Five" };

​

        Console.WriteLine("1st Element in intList: {0}", intList.ElementAt(0));

        Console.WriteLine("1st Element in strList: {0}", strList.ElementAt(0));

​

        Console.WriteLine("2nd Element in intList: {0}", intList.ElementAt(1));

        Console.WriteLine("2nd Element in strList: {0}", strList.ElementAt(1));     

​

        Console.WriteLine("intList.ElementAt(9) throws an exception: Index out of range");

        Console.WriteLine("---------------------------------------------------");

        Console.WriteLine(intList.ElementAt(9));

    }

}