private void lwvData_SelectedIndexChanged(object sender, EventArgs e) { if (rbtDatQuanHau.Checked == true) { ListView lvs = sender as ListView; if (lvs.SelectedItems.Count > 0) { string str = lwvData.SelectedItems[0].SubItems[1].ToString(); ChessBoard.Queen(str, Int32.Parse(tbxKT1.Text)); } } else { ListView lvs = sender as ListView; if (lvs.SelectedItems.Count > 0) { for (int i = 1; i <= lvs.SelectedItems.Count; ++i) { string valu = lwvData.SelectedItems[0].SubItems[0].Text.ToString(); string str = lwvData.SelectedItems[0].SubItems[1].ToString(); ChessBoard.DatKnight(valu, str, Int32.Parse(tbxKT1.Text)); } } } }