Парсинг данных онлайн-магазина на C#

			public class GetRequest
    {
        HttpWebRequest _request;
        string _address;

        public Dictionary Headers { get; set; }

        public string Response { get; set; }
        public string Accept { get; set; }
        public string Host { get; set; }
        public string Referer { get; set; }
        public string Useragent { get; set; }
        public WebProxy Proxy { get; set; }

        public GetRequest(string address)
        {
            _address = address;
            Headers = new Dictionary();
        }

        public void Run(CookieContainer cookieContainer)
        {
            _request = (HttpWebRequest)WebRequest.Create(_address);
            _request.Method = "Get";
            _request.CookieContainer = cookieContainer;
            _request.Proxy = Proxy;
            _request.Accept = Accept;
            _request.Host = Host;
            _request.Referer = Referer;
            _request.UserAgent = Useragent;

            foreach (var pair in Headers)
            {
                _request.Headers.Add(pair.Key, pair.Value);
            }

            try
            {
                HttpWebResponse response = (HttpWebResponse)_request.GetResponse();
                var stream = response.GetResponseStream();
                if (stream != null) Response = new StreamReader(stream).ReadToEnd();
            }
            catch (Exception)
            {
            }
        }
    }
		

			public class PostRequest
    {
        HttpWebRequest _request;
        string _address;

        public Dictionary Headers { get; set; }

        public string Response { get; set; }
        public string Accept { get; set; }
        public string Host { get; set; }
        public string Data { get; set; }
        public string ContentType { get; set; }
        public WebProxy Proxy { get; set; }
        public string Referer { get; set; }
        public string Useragent { get; set; }

        public PostRequest(string address)
        {
            _address = address;
            Headers = new Dictionary();
        }

        public void Run(CookieContainer cookieContainer)
        {
            _request = (HttpWebRequest)WebRequest.Create(_address);
            _request.Method = "Post";
            _request.CookieContainer = cookieContainer;
            _request.Proxy = Proxy;
            _request.Accept = Accept;
            _request.Host = Host;
            _request.ContentType = ContentType;
            _request.Referer = Referer;
            _request.UserAgent = Useragent;

            byte[] sentData = Encoding.UTF8.GetBytes(Data);
            _request.ContentLength = sentData.Length;
            Stream sendStream = _request.GetRequestStream();
            sendStream.Write(sentData, 0, sentData.Length);
            sendStream.Close();

            foreach (var pair in Headers)
            {
                _request.Headers.Add(pair.Key, pair.Value);
            }

            try
            {
                HttpWebResponse response = (HttpWebResponse)_request.GetResponse();
                var stream = response.GetResponseStream();
                if (stream != null) Response = new StreamReader(stream).ReadToEnd();
            }
            catch (Exception)
            {
            }
        }
    }
		

			static void Main(string[] args)
        {
            // артикул товара
            var code = "416001653";
            
            // прокси-сервер
            var proxy = new WebProxy("127.0.0.1:8888");
            
            // контейнер куки
            var cookieContainer = new CookieContainer();

            // запрос №1. получение адреса карточки товара по артикулу товара
            var postRequest = new PostRequest("https://baucenter.ru/");
            postRequest.Data = $"ajax_call=y&INPUT_ID=title-search-input&q={code}&l=2";
            postRequest.Accept = "*/*";
            postRequest.Useragent = "Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko";
            postRequest.ContentType = "application/x-www-form-urlencoded";
            postRequest.Referer = "https://baucenter.ru/";
            postRequest.Host = "baucenter.ru";
            postRequest.Proxy = proxy;
            postRequest.Headers.Add("Bx-ajax", "true");
            postRequest.Run(cookieContainer);

            // поиск в HTML-коде ответа адрес карточки товара
            var strStart = postRequest.Response.IndexOf("search-result-group search-result-product");
            strStart = postRequest.Response.IndexOf("
		

			/// 
    /// Класс карточка товара.
    /// Метод Parse - парсинг HTML, запись свойств Title и Price
    /// 
    public class Card
    {
        public string Price { get; set; }
        public string Title { get; set; }

        public void Parse(string html)
        {
            var priceStart = html.IndexOf("Цена") + 11;
            var priceEnd = html.IndexOf("") + 4;
            var titleEnd = html.IndexOf("", titleStart);
            Title = html.Substring(titleStart, titleEnd - titleStart).Trim();
        }
    }