Search Object and returns index of the last occurrence within the offset of the ArrayList in CSharp

using System;/*from  w  ww .j  a  v a2s  .  c o m*/
using System.Collections;
public class SamplesArrayList  {
   public static void Main()  {
      ArrayList myAL = new ArrayList();
      myAL.Add( "A" );
      myAL.Add( "G" );
      myAL.Add( "C" );
      myAL.Add( "D" );
      myAL.Add( "G" );
      myAL.Add( "F" );
      myAL.Add( "G" );
      myAL.Add( "H" );
      myAL.Add( "I" );
      myAL.Add( "J" );
      myAL.Add( "K" );
      myAL.Add( "G" );

      String myString = "G";
      int myIndex = myAL.LastIndexOf( myString, 8 );
      Console.WriteLine(myIndex );
   }
}