Search object and returns the zero-based index of the first occurrence within offset List in CSharp

using System;/*from   www. j  a  va 2 s  . com*/
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        List<string> myData = new List<string>();

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

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


        Console.WriteLine(myData.IndexOf("A", 3));
    }
}