Add value after the specified existing node in LinkedList in CSharp

using System;//  w w w  .j  a  v  a 2 s  .  c  o m
using System.Collections;
using System.Collections.Generic;

public class GenericCollection
{
    public static void Main()
    {
        LinkedList<String> ll = new LinkedList<String>();
        ll.AddLast("A");
        ll.AddLast("B");
        ll.AddLast("C");
        ll.AddLast("java2s.com");

        foreach(string s in ll){
          Console.WriteLine(s);
        }

        ll.AddAfter(ll.First,"A");

        foreach(string s in ll){
          Console.WriteLine(s);
        }

    }
}