private void detach_StuCou(StuCou entity)
 {
     this.SendPropertyChanging();
     entity.Course = null;
 }
 private void attach_StuCou(StuCou entity)
 {
     this.SendPropertyChanging();
     entity.Course = this;
 }
 partial void UpdateStuCou(StuCou instance);
 partial void DeleteStuCou(StuCou instance);
 partial void InsertStuCou(StuCou instance);