I have a method that rebuilds all the nodes in a treeview.

I save the currently selected node with:

SelectedKey = This.SelectedItem.Key

Then I clear all the nodes and rebuild the tree.

Then I want to reselect the Selected item with:

This.SelectedItem = This.Nodes[SelectedKey]
This.SelectedItem.ensurevisible

However sometimes the SelectedKey doesn't exist once the tree is rebuilt. Is there an easy way to determine that? I can't spin through all the keys because I build each branch dynamically as it is expanded. The only thing I've can think of is setting it, catching the error if it doesn't exist, and going on from there.

tia