Web Forms :: Treeview With Drag And Drop From Listbox?

Users want to have the ability on a page to have a treeview with hierarchy that can be updated by dragging and dropping from a listbox. They can drag a change request from the listbox and drop it on the treeview as a parent request or a child of one of the treenodes. There also needs to be the abililty to drag and drop from within the treeview. With all the changes being done, the item from the listbox would also need to have a field changed to either Parent = 'Yes' or IsChildOf = parent id. My first question is;

1) Is all of this possible?

2) Know of any samples or examples of how this would be accomplished?

3) Is there a better way of doing the hierarchy with parent and children then mentioned above (I hope there is)?

4) What have others done for something like this?

I am open to other thoughts of doing this a better way and I'm sure the users can be persuaded. Prepping for a Access conversion project beginning of year. And if this conversion from A2007 to ASP.NET goes well, there is another major conversion waiting in the wings.