What is the best way to implement cancel using stes

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C#

Visual-Studio

WCF

WPF

VS2010

, +

I made a program that uses wpf(C#) as client side and wcf service server side.
For data exchange i use stes(self tracking entities).


In my database i have a table clients and a table presence. database model see below

<img src="https://dl.dropboxusercontent.com/u/18695256/DB.PNG" />
database model[^]

In my wpf application i have a listbox with a list of clients and an update presence side


when a client is selected his personal info, his presence of today is shown.

<img src="https://dl.dropboxusercontent.com/u/18695256/MainWindow.PNG" />
window image[^]

I know the image is in a different language but its just to show you how it looks like.

To show the clients info i just fetch the info from the server and use a viewmodel to show presence and client info. ( if the user does not have a presence yet i make a new one and ad the client info and clientid to the presence class.



I want to implement a cancel method.
I have found:
that you can do that by making a deep copy: with something like: Clone by serialize and deserialize[^]

or make the ste track all the original values and reroll when there is clicked on cancel.


Are there other options?
And what option do you find best?