C# 彈出確定、取消窗口

if (MessageBox.Show("確定要退出嗎？", "", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.Cancel)
{}
            
MessageBoxButtons messButton = MessageBoxButtons.OKCancel;
DialogResult dialogResult = MessageBox.Show("是否確定選擇Specification Configure文件?", "Configure文件", messButton);
 if (dialogResult == DialogResult.OK)
{}