Get or set the element at the specified index in CSharp

using System;/*ww  w  .  jav a 2s . c  o m*/
using System.Collections.Generic;
using System.Collections.ObjectModel;

public class Demo
{
    public static void Main()
    {
        Collection<string> myData = new Collection<string>();

        myData.Add("A");
        myData.Add("B");
        myData.Add("C");
        myData.Add("D");

        Console.WriteLine(myData[2]);

        myData[2] = "F";

        foreach( string item in myData )
        {
            Console.WriteLine(item);
        }
    }
}