You are adding a process to the application. The process performs the following actions:
1. Opens a ContosoEntities context object named context1.
2. Loads a Part object into a variable named part1.
3. Calls the Dispose() method on context1.
4. Updates the data in part1.
5. Updates the database by using a new ContosoEntities context object named context2.

You need to update the database with the changed data from part1. What should you do?

A.
Add the following code segment before calling SaveChanges() on context2:
context2.ApplyCurrentValues(“Parts”, part1);

B.
Add the following code segment before calling SaveChanges() on context2:
context2.Attach(part1);
context2.ApplyCurrentValues(“Parts”, part1);

C.
Add the following code segment before calling SaveChanges() on context2:
context2.Attach(part1);
context2.ObjectStateManager.ChangeObjectState(part1, System.Data.EntitySate.Modified);

D.
Add the following code segment before calling SaveChanges() on context2:
context2.ApplyOriginalValues(“Parts”, part1);

Explanation:
How to: Apply Changes Made to a Detached Object
(http://msdn.microsoft.com/en-us/library/bb896248.aspx)

private static void ApplyItemUpdates(SalesOrderDetail originalItem, SalesOrderDetail updatedItem)
{
using (AdventureWorksEntities context = new AdventureWorksEntities())
{
context.SalesOrderDetails.Attach(updatedItem);
// Check if the ID is 0, if it is the item is new.
// In this case we need to chage the state to Added.
if (updatedItem.SalesOrderDetailID == 0)
{
// Because the ID is generated by the database we do not need to
// set updatedItem.SalesOrderDetailID.
context.ObjectStateManager.ChangeObjectState(updatedItem, System.Data.EntityState.Added);
}
else
{
// If the SalesOrderDetailID is not 0, then the item is not new
// and needs to be updated. Because we already added the
// updated object to the context we need to apply the original values.
// If we attached originalItem to the context
// we would need to apply the current values:
// context.ApplyCurrentValues(“SalesOrderDetails”, updatedItem);
// Applying current or original values, changes the state
// of the attached object to Modified.
context.ApplyOriginalValues(“SalesOrderDetails”, originalItem);
}
context.SaveChanges();
}
}