You are implementing an application that uses LINQ to SQL to update a data source. You add the following code that uses a DataContext named northwindContext:

using (TransactionScope ts = new TransactionScope(TransactionScopeOption.Required))
{
Product prod1 = northwindContext.Products.First(p => p.ProductID == 4);
Product prod2 = northwindContext.Products.First(p => p.ProductID == 5);
prod1.UnitsInStock -= 3;
prod2.UnitsInStock -= 5;
northwindContext.SubmitChanges();
ts.Complete();
}

This method is called by code that creates a transaction scope. You are debugging by stepping through this method. You notice that the data source is not updated after you step over the call to the Complete method. You need to ensure that the data source is updated.

What should you do?