using System;

using System.Collections;

​

public class Program

{

    public static void Main()

    {

        var arlist = new ArrayList()

                {

                    1,

                    "Bill",

                    300,

                    4.5f

                };

​

        //Access individual item using indexer

        int firstElement = (int) arlist[0]; //returns 1

        Console.WriteLine("1st element is:" + firstElement);

        string secondElement = (string) arlist[1]; //returns "Bill"

        Console.WriteLine("2nd element is:" + secondElement);

        //int secondElement = (int) arlist[1]; //Error: cannot cover string to int

​

        //using var keyword without explicit casting

        var first = arlist[0]; //returns 1

        var second = arlist[1]; //returns "Bill"

        //var fifthElement = arlist[5]; //Error: Index out of range

​

        //update elements

        arlist[0] = "Steve"; 

        arlist[1] = 100;

        //arlist[5] = 500; //Error: Index out of range

    }

}

​