private void BookDeleteBtn_Click(object sender, EventArgs e) { string booknum = bookNumTB.Text; string bookName = bookTitleTB.Text; if (!string.IsNullOrEmpty(booknum)) { if (MessageBox.Show("선택하신 \"" + bookName + "\" 을(를) 정말 삭제 하시겠습니까?", "", MessageBoxButtons.YesNo) == DialogResult.Yes) { string bookCode = "BC_" + booknum; db.DeleteBook(bookCode); db.GetBooksList(BookListView); } } else { MessageBox.Show("책을 선택해 주세요."); } }