HelpProvider控件的使用

代码如下：

            string helpStr = Application.StartupPath.Substring(0,Application.StartupPath.LastIndexOf("\\"));
            helpStr += @"\mrHelp.chm";
            helpProvider1.HelpNamespace = helpStr;
            helpProvider1.SetShowHelp(this, true);

附：窗体显示问号按钮的属性设置