private void detach_comp(comp entity)
		{
			this.SendPropertyChanging();
			entity.task = null;
		}
		private void attach_comp(comp entity)
		{
			this.SendPropertyChanging();
			entity.task = this;
		}
 partial void Updatecomp(comp instance);
 partial void Deletecomp(comp instance);
 partial void Insertcomp(comp instance);