partial void DeletelessonplanPlanactivite(lessonplanPlanactivite instance);
 partial void InsertlessonplanPlanactivite(lessonplanPlanactivite instance);
 partial void UpdatelessonplanPlanactivite(lessonplanPlanactivite instance);
    public bool isLessonplanActivityAdded( int lessonplanID, int activityID )
    {
        lessonplanPlanactivite lpa = new lessonplanPlanactivite() {
            lessonPlan_ID = lessonplanID,
            planActivity_ID = activityID
        };

        try {
            MOE_DB.lessonplanPlanactivites.InsertOnSubmit( lpa );
            MOE_DB.SubmitChanges();
            return true;
        }
        catch(Exception ex) {
            return false;
        }
    }