How can
ItemCheckedEventArgs.Item.Selected = ItemCheckedEventArgs.Item.Checked
generate "The given key was not present in the dictionary." ??
How can
ItemCheckedEventArgs.Item.Selected = ItemCheckedEventArgs.Item.Checked
generate "The given key was not present in the dictionary." ??
The confusion was due to the fact that VS does not step into event handlers when you step through properties, so I wasn't seeing the error in my SelectedIndexChanged handler.