I need this exactly, but in an ASP.Net 3.5 control.
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Hide the javascript layer, and make it a pure control.
Basically, I need the same functionality of the AjaxControlToolkit's ReorderList control, but that the items can also be moved to another ReorderList control.
## Deliverables
Requirements
* State of the item orders in containers should maintain across postbacks.
* Should be able to work inside UpdatePanel
* Written in C#
* Should be able to be add/delete items to a container in code-behind
* Should have an event when an item is dropped on a container that provides the IDs of the item that got dropped, which container it was dropped to, and which container it was dragged from