Слетела кодировка при парсинге html-страницы

 private String GetPage(String url, String referer, String cookies)
        {
            HttpWebRequest myHttpWebRequest = (HttpWebRequest)HttpWebRequest.Create(url);
            myHttpWebRequest.Referer = referer;
            myHttpWebRequest.UserAgent = "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36 OPR/34.0.2036.47 (Edition Yx)";
            myHttpWebRequest.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8";
            myHttpWebRequest.Headers.Add("Accept-Language", "ru-RU,ru;q=0.8,en-US;q=0.6,en;q=0.4");
            myHttpWebRequest.Headers.Add("Accept-Encoding", "gzip, deflate, lzma, sdch");
            myHttpWebRequest.Headers.Add("Upgrade-Insecure-Requests", "1");
            myHttpWebRequest.ContentType = "text/html";
            myHttpWebRequest.Headers.Add(HttpRequestHeader.Cookie, cookies);
            HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
            StreamReader myStreamReader = new StreamReader(myHttpWebResponse.GetResponseStream(), Encoding.GetEncoding(1251));
            return myStreamReader.ReadToEnd();
        }

StreamReader myStreamReader = new StreamReader(myHttpWebResponse.GetResponseStream(), Encoding.GetEncoding(1251));