Our last step will be to implement the "Update" action method on our ProductController class: 

Figure 39

Like our previous "Create" action method we'll take advantage of the "UpdateFrom" extension method to automatically populate our product object from the request.  Notice that rather then populate an empty product object though, we are using a pattern where we first retrieve the old values from the database, then apply the changes the user made to them, and then save them in the database. 

Once the edit is made, we redirect back to the Product Listing page - and automatically set the /Products/Category/[CategoryID] to match the saved state of the Product we were working on.