C# winform 关闭窗口前确认

close.cs

private void Form2_FormClosing(object sender, FormClosingEventArgs e)
{
    e.Cancel = (MessageBox.Show("Sure?",
                            "Exit",
                            MessageBoxButtons.YesNo,
                            MessageBoxIcon.Question) == DialogResult.Yes);

    DialogResult result = MessageBox.Show("提示", "确定退出吗？", MessageBoxButtons.YesNo, MessageBoxIcon.Question);
    if (result == DialogResult.Yes)
    {
        e.Cancel = false;
    }
    else
    {
        e.Cancel = true;
    }
}