static async Task worker()
        {
            Console.WriteLine("Launched against " + SiteUrl + ", start extraction....");

            try
            {
                if (!Directory.Exists(folder)) Directory.CreateDirectory(folder);
            }
            catch { }

            try
            {
                if (!Directory.Exists("_TEMP_")) Directory.CreateDirectory("_TEMP_");
            }
            catch { }

            await ExtractPageLinks(SiteUrl);
        }

        static async Task<List<string>> ExtractPageLinks(string url)
        {
            List<string> pagelinks = new List<string>();

            try
            {
                visitedlinks.Add(url);

                pagelinks = await ExtractFileLinks(url);

                if (++GoodLinksCount >= maxlinks) return pagelinks;

                foreach (string link in pagelinks) if (!IsVisited(link) && IsLocal(link))
                        await ExtractPageLinks(link);
            }
            catch { }

            return pagelinks;
        }

        static async Task<List<string>> ExtractFileLinks(string url)
        {
            try
            {
                bool gotfile = false;

                Console.WriteLine("--------------------");
                Console.WriteLine();
                Console.Write("DOWNLOAD: " + url);

                string filename = name(url);

                if (filename.StartsWith(".")) filename = "tmp" + filename;

                string fullname = Path.Combine("_TEMP_", filename);

                try
                {
                    using (WebClient wc = new WebClient())
                    {
                        wc.DownloadFile(url, fullname);

                        Console.WriteLine(" OK");
                        Console.WriteLine();
                        Console.WriteLine("SAVED: " + fullname);

                        gotfile = true;
                    }
                }
                catch {
                    Console.WriteLine(" ERROR");

                    Console.Write("GET: " + url);

                    try
                    {
                        string html = GetSiteHtml(url);

                        Console.WriteLine(" OK");

                        fullname += ".tmp.html";

                        Console.WriteLine();

                        Console.WriteLine("SAVING: " + fullname);

                        File.WriteAllText(fullname, html);

                        gotfile = true;

                    } catch
                    {
                        Console.WriteLine(" ERROR");
                    }
                }

                List<string> links = new List<string>();

                if (gotfile)
                {
                    Console.WriteLine("\nANALYSE: " + fullname);

                    List<string> UnicodeLinks = await ExtractFromFile(url, fullname, true);

                    List<string> AsciiLinks = await ExtractFromFile(url, fullname, false);

                    foreach (string l in UnicodeLinks) links.Add(l);
                    foreach (string l in AsciiLinks) links.Add(l);

                    Console.WriteLine("\t{0} links extracted\n", links.Count);
                    Console.WriteLine("\t----");
                    Console.WriteLine("\t{0} links processed total", visitedlinks.Count);

                    //foreach (string l in links) Console.WriteLine("LINK: " + l);

                    if (IsNeeded(fullname)) // FIX check file size here
                        try
                        {
                            bool sizeok = false;

                            DirectoryInfo di = new DirectoryInfo("_TEMP_");
                            FileInfo[] fiArr = di.GetFiles();
                            foreach (FileInfo f in fiArr) if (f.FullName.IndexOf(filename) > -1)
                    {
                    if (f.Length >= minsize * 1024 * 1024) sizeok = true;

                    break;
                    }
                            if (sizeok)
                    File.Copy(fullname, Path.Combine(folder, filename), true);
                        }
                        catch { }

                    try { File.Delete(fullname); } catch { }
                }

                return links;

            } catch { return new List<string>(); }
        }