获取浏览器版本号的方法

//获取浏览器版本号   
        public void getBrowser()
        {
            string browsers=string.Empty;
            HttpBrowserCapabilities bc = HttpContext.Current.Request.Browser;
            //HttpApplicationState
            string strBrowser = bc.Browser.ToString().ToLower();
            string strVersion = bc.Version.ToString();
            if (strBrowser != "ie")
            {
                Common.AjaxHelper.alert("系统检测到您的默认浏览器不是IE，建议将IE设成默认浏览器",this.Page);
            }
            else
            {
                if (strVersion != "8.0")
                {
                    Common.AjaxHelper.alertUrl("系统检测到您的IE版本较低，建议升级成8.0版本，确认升级吗？", "template/Bgsc/IE8.0.zip");
                }
            }
        }