LINQ to SQL - Updating Data Context Objects in Partial Classes

Question

I created an extensibility method to delete one of my Linq To Sql objects called Reservation.

Well, in this partial method that I created, I want to update some other objects. It seems that the update is not saved in the database. Here is my partial backup deletion method.

public partial class LawEnforcementDataContext
{

    partial void DeleteReservation(Reservation instance)
    {
        // Get ID of those seated in course
        var roster = new Roster(this, instance.CourseID);
        var seated = from r in roster.All
                     where r.WaitingList == false
                     select r.ID;

        // delete the reservation
        this.ExecuteDynamicDelete(instance);

        // get seated id not in original seated ids
        var newlySeated = from r in roster.All
                          where r.WaitingList == false && !seated.Contains(r.ID)
                          select r.ID;

        var reservations = this.Reservations.Where(r => newlySeated.Contains(r.ID));

        foreach (var r in reservations)
        {
            r.Confirmed = false;
            // Have tried doing nothing, thinking calling code db.SubmitChanges() would do the trick
            //this.ExecuteDynamicUpdate(r); HAVE TRIED THIS
        }
        //this.SubmitChanges(); HAVE TRIED THIS
    }
}

Removing occurs, but no update. Commented on the last few lines some of the things I tried.

Any ideas? Thanks!

EDIT

Here is what I did to solve this problem:

   public override void SubmitChanges(System.Data.Linq.ConflictMode failureMode)
{
    ChangeSet delta = GetChangeSet();

    foreach (var res in delta.Deletes.OfType<Reservation>())
    {
        // Get ID of those seated in course
        var roster = new Roster(this, res.CourseID);
        var seated = from r in roster.All
                     where r.WaitingList == false
                     select r.ID;

        base.SubmitChanges(failureMode);

        // get seated id not in original seated ids
        var newlySeated = from r in roster.All
                          where r.WaitingList == false && !seated.Contains(r.ID)
                          select r.ID;

        var reservations = this.Reservations.Where(r => newlySeated.Contains(r.ID));

        foreach (var r in reservations)
        {
            r.Confirmed = false;
        }
    }

    base.SubmitChanges(failureMode);
}

Answer 1

, , GetChangeSet().

SubmitChanges() ...

partial class LawEnforcementDataContext
{
    public override void SubmitChanges(
        System.Data.Linq.ConflictMode failureMode)
    {
        ChangeSet delta = GetChangeSet();
        foreach (var reservation in delta.Deletes.OfType<Reservation>())
        {
            // etc
        }
        base.SubmitChanges(failureMode);
    }
}

Answer 2

: DataContext linqtosql - /

, .