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Get the state of a TreeView after node population (ASP.NET 3.5)

Basically what I'm trying to do is get the previous state of a treeview and compare it with a changed state of the same treeview. This is so I can make changes to the database based on the changed treeview.

I've tried to capture the TreeView on the PreRender event, but it seems that the TreeNodePopulate event comes after that. The TreeNodePopulate event doesn't seem to be the right place to capture that information.

Any ideas?

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