How do I get at the listbox item's “key” in c# winforms app?

Question

I am writing a winforms app in which a user selects an item from a listbox and edits some data that forms part of an associated object. The edits are then applied from the o

Answer 1

Okay so the answer came as a result of Andy's answer, hence my upvoting that answer.

But when I created a little class and tried to cast the listitem into that class the program threw an exception.

Revealingly the exception told me that the program could not cast a DictionaryEntry into a class of the type I had defined.

So I deleted the proxy class and reframed the request thus:

DictionaryEntry de = (DictionaryEntry)listbox.SelectedItem;

string htKey = de.Key.ToString();

And it's all good.

Bizarrely simple answer in the end. Thanks for the hint Andy.