C#如何禁止关闭按钮，简单几句禁止C#窗体关闭按钮。

        protected override CreateParams CreateParams
        {
            get
            {
                int CS_NOCLOSE = 0x200;
                CreateParams parameters = base.CreateParams;
                parameters.ClassStyle |= CS_NOCLOSE;
                return parameters;
            }
        }