//readonly ICrawler crawler = new Crawler();


        public List <Menu> ExtractMenu(string url)
        {
            var html = _crawler.Extract(url);

            var ListMenu = new List <Menu>();

            var htmlDocument = new HtmlDocument();

            htmlDocument.LoadHtml(html);

            var MenuHtml = htmlDocument.DocumentNode.Descendants("nav")
                           .Where(node => node.GetAttributeValue("id", "")
                                  .Equals("main_menu")).ToList();

            var MenuListItems = MenuHtml[0].Descendants("a")
                                .Where(node => node.GetAttributeValue("class", "")
                                       .Contains("mnu_")).ToList();

            foreach (var MenuItem in MenuListItems)
            {
                var menu = new Menu
                {
                    Title = MenuItem.InnerText.Trim('\r', '\n', '\t', ' '),

                    Url = MenuItem.Attributes["href"].Value
                };
                ListMenu.Add(menu);
            }

            return(ListMenu);
        }