private void BindLists() { Cities.DataSource = EnumUtils.GetDescriptions(typeof(Entities.Cities)); Cities.DataBind(); var teachersWithGardens = new KindergardenQuery().Get().Select(x => x.Teacher).ToList(); Teachers.DataSource = new TeachersQuery().Get().ToList().Except(teachersWithGardens); Teachers.DataBind(); ChildrenList.DataSource = new ChildQuery().Get(); ChildrenList.DataBind(); }