private void lstv_kitaplar_DoubleClick(object sender, EventArgs e) { if (lstv_kitaplar.SelectedItems.Count == 1) { Frm_Kitap ktp = new Frm_Kitap(); ktp.id = lstv_kitaplar.SelectedItems[0].Text; ktp.BackColor = arkaplan; ktp.Show(); this.Hide(); } }