C#中重载窗体关闭事件

protected override void OnFormClosing(FormClosingEventArgs e)
        {
            if (MessageBox.Show("你确认要退出该程序吗？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button2) == DialogResult.Yes)
                base.OnFormClosing(e);
            else
                e.Cancel = true;
        }