partial void Deleteservice(service instance);
 partial void Updateservice(service instance);
		private void detach_services(service entity)
		{
			this.SendPropertyChanging();
			entity.service_type = null;
		}
 partial void Insertservice(service instance);
		private void attach_services(service entity)
		{
			this.SendPropertyChanging();
			entity.service_type = this;
		}