private void BookReport_Load(object sender, EventArgs e) { using (BookService service = new BookService()) { lstBooks.DataSource = service.List(); lstBooks.DisplayMember = "BookName"; lstBooks.ValueMember = "BookId"; } using (BorrowService service = new BorrowService()) { lstPenalties.DataSource = service.GetPEnaltyStudents(); lstPenalties.DisplayMember = "FullName"; lstPenalties.ValueMember = "StudentId"; } }