ASP.NET 4.0 AJAX - Pseudo Columns

With the ASP.NET 4.0 AJAX previews, there is the concept of a pseudo column.  This is similar in concept to Oracle's rownum and rowid columns that are returned in a query.  The two columns that ASP.NET 4.0 AJAX when doing databinding are $index and $dataItem. 

$index is an integer which represents the current record in the data binding operation.

Original Url: http://morewally.com/cs/blogs/wallym/archive/2009/03/16/asp-net-4-0-ajax-pseudo-columns.aspx