debug is undefined

try removing the ScriptReference lines and see what will happen.

Removing the ScriptReference got rid of the debug is undefined but the drag n drop doesn't work. Any suggestions?

Try looking into

<ajaxToolkit:DragPanelExtender ... >

What you need is to add AjaxControlTookit.dll into your bin and register it on the page that you use it.

<%@. Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>

and then you can you use <ajaxToolkit:DragPanelExtender ... ... >

Hope it helps ........ have fun.

What I want to do is have a couple of category list and items that I can drag and move them between the different category list. Would using the DragPanelExtender be the most efficient why of implementation this? How would I put restriction on dragging an item into a specific list base on a criteria?