public static add_book_frm getInstance() { if (uniqueInstance == null) { uniqueInstance = new add_book_frm(); } return(uniqueInstance); }
private void toolStripButton1_Click(object sender, EventArgs e) { add_book_frm frm = add_book_frm.getInstance(); set_child_frm(frm, panel1); frm.read_from_database_to_listview(); frm.BringToFront(); }