EntityFramework 4.0 Attach Entity objects

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C#

.NET

EF4.0

Hello,

I am using Entity Framework 4.0 and following issue occurs while updating objects (rows) in database:

I have two related tables, say A and B, with A being the master table and B foreign table. Now in my C#.NET application, I make changes from front end and save it.

In save method, I only update those Entity objects whose EntityState is Modified. When I reach Save method, the EntityState of objects of both A and B are Modified. If A's object state is Modified, I attach A's Entity object with EF context, so its state becomes Unchanged (because when an Entity object is attached, its state becomes Unchanged), but as I know it was Modified so I immediately set it to Modified and call context's SaveChanges method.

But the problem occurs now: when I attach A's Entity object to context, EntityState of all related object of type B also becomes Unchanged. So after updating A's object when it reaches to process for B, its EntityState gets Unchanged and so it doesn't update B's objects. Also I have no track of which object of B had state Modified prior attaching A's object.

I need a way that when parent table's entity object is attached to context, it does not attach foreign table's related objects to EF context.

Please provide solution for this. Thanks in advance. :)