string webResource = @"https://2pin.ru";
            string result = "";

            try
            {

                using (var wb = new WebClient())
                {
                    WebProxy proxy = new WebProxy("185.***.6*.***", 9698);
                    proxy.Credentials = new NetworkCredential("login", "password"); 
                    proxy.UseDefaultCredentials = false;
                    proxy.BypassProxyOnLocal = false;  //still use the proxy for local addresses

                    wb.Proxy = proxy;
                    wb.Encoding = System.Text.Encoding.UTF8;
                    var response = wb.DownloadString(webResource);
                    result = (string)response;
                    //result = Encoding.ASCII.GetString(wb.DownloadData("http://www.google.com"));
                }

            }
            catch
            {
                result = "ошибка загрузки";
            }

            Console.WriteLine(result);

            string webResource = @"https://2pin.ru";
            string result = "";

            WebProxy proxy = new WebProxy("185.***.6*.***", 9698);
                    proxy.Credentials = new NetworkCredential("login", "password"); 
                    proxy.UseDefaultCredentials = false;
                    proxy.BypassProxyOnLocal = false;

            var request = WebRequest.Create(webResource);
            request.Proxy = proxy;
            var stream = request.GetResponse().GetResponseStream();
            var content = new StreamReader(stream).ReadToEnd();

            Console.WriteLine(content);
            Console.ReadLine();