System.Net.ServicePointManager.ServerCertificateValidationCallback = ((sender, certificate, chain, sslPolicyErrors) => true);
           
            HttpWebRequest m_hwrequest = (HttpWebRequest)HttpWebRequest.Create(sUrl);
          
            //----------------------------------------------------------
            m_hwrequest.ServicePoint.Expect100Continue = false;
            
          
            m_hwrequest.ProtocolVersion = System.Net.HttpVersion.Version11;
            m_hwrequest.KeepAlive = true;
            
            m_hwrequest.Method = @"GET";
            m_hwrequest.ProtocolVersion = System.Net.HttpVersion.Version11;
            m_hwrequest.Accept = @"text/html, application/xhtml+xml, */*";
            m_hwrequest.Host = sHost;
            m_hwrequest.KeepAlive = true;
            m_hwrequest.UserAgent = @"User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko";
            m_hwrequest.Headers.Add(@"Accept-Language", @"Accept-Language: ru-RU");
            m_hwrequest.Headers.Add(@"Accept-Encoding", @"Accept-Encoding: gzip, deflate");
            m_hwrequest.Headers.Add(@"DNT", @"DNT: 1");
            
            HttpWebResponse resp = (HttpWebResponse)m_hwrequest.GetResponse();
            StreamReader myStreamReader =
             new StreamReader(
               resp.GetResponseStream(), Encoding.GetEncoding(1251));
                        richTextBox1.Text = myStreamReader.ReadToEnd();