C# WinForm开发 取消窗体关闭按钮

C# WinForm开发 取消窗体关闭按钮

//禁用窗体的关闭按钮
        private const int CP_NOCLOSE_BUTTON = 0x200;
        protected override CreateParams CreateParams
        {
            get
            {
                CreateParams myCp = base.CreateParams;
                myCp.ClassStyle = myCp.ClassStyle | CP_NOCLOSE_BUTTON;
                return myCp;
            }
        }

public Form1()
        {
            InitializeComponent();
            this.ControlBox = false;   // 设置不出现关闭按钮
        }