Toy Store Best Practice: How to implement 'cancel' for register user page

Let's say user wants to register or (even edit) his/her account. But when forwards to register(edit) account page, he/she decides not to do it. I would like to implement 'cancel' button and return the user whereever he/she was before comming to this page.
What is the best practice?
Even worse, if user gets to this page and never saves the entry. The model would be dirty. And then let's say that user wants to commit something in DB, it may commit incorrect(blank) entry for created row. What I am up to, is what is the best practice to keep track if the model gets dirty and delete invalid rows in general?

You might want to read this thread:
Cancel operation followed by refresh raises JBO-33035
(very similar discussion I was having with Steve)

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