private void DownloadData(string word)
        {
            WebClient client = new WebClient();

            client.Headers.Add("User-Agent",
                               "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.121 Safari/537.36");

            try
            {
                String        url      = $"https://www.howtopronounce.com/{word}/";
                String        html     = Encoding.UTF8.GetString(client.DownloadData(url));
                List <String> audioURL = GetAudioURL(html);

                if (audioURL.Count > 0)
                {
                    TrainingEntry entry = null;

                    lock (this)
                    {
                        entry = ds.GetEntry(word);
                    }

                    entry.Word      = word;
                    entry.Phonetics = "";
                    lock (this)
                    {
                        totalEntryCount++;
                    }

                    String path = @"d:\" + Convert.ToBase64String(Encoding.ASCII.GetBytes(word)).Replace("=", "")
                                  .Replace("/", "").Replace("\\", "") + ".mp3";
                    foreach (String u in audioURL)
                    {
                        client.DownloadFile(u, path);
                        entry.AddAudio(path, "HowToPronounce@" + url);

                        lock (this)
                        {
                            totalAudioCount++;
                        }
                        File.Delete(path);
                    }
                    Console.WriteLine($"{totalEntryCount} -> {totalAudioCount}");
                }
            }
            catch (Exception ex)
            {
                int h = 0;
            }
        }
        private void DownloadData(string url)
        {
            WebClient client = new WebClient();

            try
            {
                String html     = Encoding.UTF8.GetString(client.DownloadData(url));
                String audioURL = GetAudioURL(html);

                if (audioURL != null)
                {
                    String path = @"d:\" + Convert.ToBase64String(Encoding.ASCII.GetBytes(audioURL)).Replace("=", "")
                                  .Replace("/", "").Replace("\\", "") + ".mp3";
                    String word      = GetWord(html);
                    String phonetics = GetPhonetics(html).Trim();

                    if (phonetics != null)
                    {
                        client.DownloadFile(audioURL, path);
                        TrainingEntry entry = null;

                        lock (this)
                        {
                            entry = ds.GetEntry(word);
                        }

                        entry.Word      = word;
                        entry.Phonetics = phonetics;
                        entry.AddAudio(path, "Longman@" + url);

                        lock (this)
                        {
                            totalCount++;
                        }

                        Console.WriteLine(totalCount);
                        File.Delete(path);
                    }
                }
            }
            catch (Exception ex)
            {
                int h = 0;
            }
        }