How Do I: Retrieve Values From Server Side AJAX Controls

I can't get this example to work - Every time I resort the items I get an error message - "Reorder failed...Can't reorder DataSource. It is not a DataSource and does not implement IList." I'm using the VB code.  Any ideas?

I could not get the example to function until I removed the Required Field Validator which was part of the previous tutorial's solution, but not in the C# solution for this example.  Is it not possible to the Validator control operable in this example?