private void bt_delete_Click(object sender, EventArgs e) { if (str_bh == "") { return; } ywszbiz.Delete_tj_xmmb_hd(str_bh); MessageBox.Show("删除成功!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information); ClearControl(); str_bh = ""; tv_jbmb.Nodes.Remove(tv_jbmb.SelectedNode); }