How to tell if user has modified data using bindingsource?

Question

I have a DataGridView bound to a bindingsource which is bound to a List. The user clicks a row that goes to a form with textboxes, etc. The textboxes a

Answer 1

From my updated question I found I had to store a current version of the object at BeginEdit using Memberwise.Clone and then in CancelEdit I restored that to the current.