private void listView3_SelectedIndexChanged(object sender, EventArgs e)
        {
            pdf = new KitapOku();

            if (listView3.SelectedItems.Count > 0)
            {
                ListViewItem item = listView3.SelectedItems[0];
                pictureBox3.ImageLocation = item.SubItems[5].Text;
                pdf.Kitapoku(path);
                pdf.Show();
            }
        }
        private void listView4_SelectedIndexChanged(object sender, EventArgs e)
        {
            pdf = new KitapOku();

            if (listView4.SelectedItems.Count > 0)
            {
                ListViewItem item = listView4.SelectedItems[0];
                pictureBox4.ImageLocation = item.SubItems[5].Text;
                tisbn.Text       = item.SubItems[0].Text;
                tbooktitle.Text  = item.SubItems[1].Text;
                tbookauther.Text = item.SubItems[2].Text;
                tyearpublic.Text = item.SubItems[3].Text;
                tpublisher.Text  = item.SubItems[4].Text;
                pdf.Kitapoku(path);
                pdf.Show();
            }
        }