Does this help? http://stackoverflow.com/questions/609594/what-is-the-use-of-indexers

>I have this customer class:

>public class Customer
>{
>    private List<Invoice> _Invoices = new List<Invoice>();
>    public Invoice this[int item]
>    {
>        get
>        {
>            return _Invoices[item];
>        }
>        set
>        {
>            _Invoices[item] = value;
>        }
>    }
>}

>I then do this:

>static void Main(string[] args)
>{
>    Invoice InvA = new Invoice();
>    InvA.InvoiceId = "A0001";
>
>    Invoice InvB = new Invoice();
>    InvB.InvoiceId = "B0002";
>
>    Customer cust = new Customer();
>    cust[0] = InvA;
>    cust[1] = InvB;
>}>

>I'm not really seeing a usage for indexers. It seems to me that an Invoices collection would be better. What's the point of indexers?