private string page = string.Empty;

        public void GetContentBy(string url)
        {
            HttpWebRequest request;
            try
            {
                request = WebRequest.CreateHttp(url);
                request.BeginGetResponse(ProcessWebRequest, request);
            }
            catch (Exception)
            {
            }  
        }

        private void ProcessWebRequest(IAsyncResult result)
        {
            HttpWebRequest httpWebRequest = (HttpWebRequest)result.AsyncState;
            HttpWebResponse httpWebResponse = (HttpWebResponse) httpWebRequest.EndGetResponse(result); // *
             
            Stream responseStream = httpWebResponse.GetResponseStream();

            if (httpWebResponse.StatusCode == HttpStatusCode.OK)
            {
                StreamReader reader = new StreamReader(responseStream, Encoding.GetEncoding("1251"));
                page = reader.ReadToEnd();
            }
        }