private void btnSaveNew_Click(object sender, EventArgs e)
        {
            appDB = new AppDatabase();
            string newbook = appDB.addNewBook(txtBookTitle.Text, txtBookCode.Text, txtNotes.Text);

            if (newbook == "success")
            {
                loadFeedback("A new book " + txtBookTitle.Text + "has been added successfully!", true, true);
                loadBooks();
                clearFields();
            }
            else
            {
                loadFeedback("Unable to add a book: " + newbook, false);
            }
        }