C# Winform弹出确认窗口

C# Winform弹出确认窗口

   
   private void btn_Click(object sender, EventArgs e)
   {

        MessageBoxButtons mess = MessageBoxButtons.OKCancel;
        DialogResult d = MessageBox.Show("确定要关闭吗？", "提示", mess);
        if (d == DialogResult.OK)
        {
            MessageBox.Show("关闭成功");
        }

   }