问实体框架6、事务范围、上下文和SaveChanges

EN

using(TransactionScope ts = new TransactionScope( TransactionScopeOption.RequiresNew, new TimeSpan(0, 10, 0)))
{
    int counter = 0;
    using (MyEntities context = new MyEntities())
    { 
        foreach(var item in context.Items)
        {
            //process item
            if(counter >= 1000)
            {
                context.SaveChanges(); //if fail here, will already saved changes be rolled back?
                counter = 0
            }
        }
        context.SaveChanges();
    }
    ts.Complete();//what about here?
}