MessageBox 置顶
DialogResult result = MessageBox.Show("确认关闭窗口？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question, 0, MessageBoxOptions.ServiceNotification);
DialogResult result = MessageBox.Show("确认关闭窗口？", "提示", MessageBoxButtons.YesNo, MessageBoxIcon.Question, 0, MessageBoxOptions.ServiceNotification);