checkpointing with multiple forms

Hi, I am using a single instance of PersistenceManager throughout my MDI Windows app.

1. User opens Customer List form.
2. BeginCheckPoint() is called in the constructor.
3. User makes changes to a customer.
4. Without closing Customer form, user then opens Order List form.
5. BeginCheckPoint() is called in the constructor.
6. User makes changes to an order.
7. User decides to go back to Customer List form then cancels changes and closes the form at which point RollbackCheckPoint() is called.

It looks like the RollbackCheckPoint() call rolls back changes made to the order at step 6 not the customer.

I think I understand why this happens but I wonder if there is any way to achieve what I am trying to achieve that is to roll back changes made to the customer at step 3.  Is there any way to do that without using more than one instance of PersistenceManager?

Thanks for your help in advance.

OK, I can use multiple PMs.  How do I merge changes saved by different PMs?  Is there a quick and efficient way to do it?

I actually saw this post but wasn't quite sure how to use the pm.importentities() method to "refresh" anything.

I have two forms, let's call it FormA and FormB.  Each form is using its own instance of the PM.

In FormA, I have a grid control that displays the customer listing.

In FormB, I followed the steps suggested in the post (http://www.ideablade.com/forum/forum_posts.asp?TID=234) in order to sync up data between the two PMs.  My "import entities" code looks something like below:

FormAPersMgr.ImportEntities(mModifiedEntityList, MergeStrategy.OverwriteChanges)
FormAPersMgr.ImportEntities(mAddedEntityList, MergeStrategy.OverwriteChanges)

mModifiedEntityList contains modified entities while mAddedEntityList contains added entities that I saved in the PM's Saving event.

Now, after I execute the above two statements, I would expect FormA's PM to have the changes I made in FormB.  However, it doesn't.

What am I doing wrong?

You are correct.  It is not automatic.  Furthermore, not all users want it to be automatic.  Many users do not want their forms being modified by other PM's.  As a developer, you get to decide how you want your separate PM's tp interact with each other.

or you can use ImportEntities.