主题：[求助]关闭窗口前用户按下了增加按钮

是编写beforeclose事件么？

Dim Result As DialogResult
Result = MessageBox.Show("关闭窗口前要保存数据吗?", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question)
If Result = DialogResult.Yes Then
    Dim btn As WinForm.Button = e.Form.Controls("ButtonAdd")
    btn.PerformClick()
End If