Как работает простой цикл while в примере c telegram api?

result: [
  {
   <b> update_id: 969654782</b>,
    message: {
      message_id: 30,
      from: {
        id: 394354774,
        is_bot: false,
        first_name: "name",
        last_name: "last_name",
        language_code: "ru",
      },
      chat: {
        id: 394354774,
        first_name: "name",
        last_name: "last_name",
        type: "private",
      },
      date: 1519757969,
      text: "2",
    },
  },
  {1},
  {2},
  {3},
]

string url = $"{startUrl}/getUpdates?offset={0 + 1}

#region Бот Телеграмм

            int update_id = 0;
            string messageFromId = "";
            string messageText = "";
            string token = "540661148:AAEYEIzOKMNGWR6ZCXV-EPS7wII9UHgfVq0";

            WebClient webclient = new WebClient();
            string startUrl = $"https://api.telegram.org/bot{token}";


            while(true)
            {
                string url = $"{startUrl}/getUpdates?offset={update_id + 1}";
                string response = webclient.DownloadString(url);

                var array = JObject.Parse(response)["result"].ToArray();

                foreach(var msg in array)
                {
                    update_id = Convert.ToInt32(msg["update_id"]);
                    try
                    {
                        messageFromId = msg["message"]["from"]["id"].ToString();
                        messageText = msg["message"]["text"].ToString();

                        Console.Write($"{update_id} {messageFromId} {messageText}");

                        var req = messageText.Split(' ');
                        url = $"{startUrl}/sendMessage?chat_id={messageFromId}&text={messageText}";
                        webclient.DownloadString(url);
                    }
                    catch { }
                }

                Thread.Sleep(100); // 1s = 1000ms
            }

            #endregion