Telegram Bot CSharp C# .Net

telegram.bot.cs

using Telegram.Bot;
using Telegram.Bot.Exceptions;
using Telegram.Bot.Polling;
using Telegram.Bot.Types;
using Telegram.Bot.Types.Enums;

namespace ConsoleApp1;

class Program
{
    static TelegramBotClient Bot;
    static string BOT_TOKEN = "";

    static async Task Main() {
        var cts = new CancellationTokenSource();

        try {
            Bot = new TelegramBotClient(BOT_TOKEN);

            var me = await Bot.GetMeAsync();
            Console.WriteLine($"Start listening for @{me.Username}");

            await Bot.ReceiveAsync(new DefaultUpdateHandler(UpdateHandler, PollingErrorHandler), new ReceiverOptions(), cts.Token);

            async Task PollingErrorHandler(ITelegramBotClient telegramBotClient, Exception exception, CancellationToken cancellationToken)
            {
                var ErrorMessage = exception switch {
                    ApiRequestException apiRequestException => $"Telegram API Error:\n[{apiRequestException.ErrorCode}]\n{apiRequestException.Message}",
                    _ => exception.ToString()
                };

                Console.WriteLine(ErrorMessage);
            }

            async Task UpdateHandler(ITelegramBotClient telegramBotClient, Update update, CancellationToken cancellationToken)
            {
                if (update.Type != UpdateType.Message)
                    return;

                try { 
                    BotOnMessageReceived(update.Message);
                } catch (Exception exception) {
                    await PollingErrorHandler(telegramBotClient, exception, cancellationToken);
                }
            }
        } catch (Exception ex) {
            Console.WriteLine(ex.Message);
            cts.Cancel();
        }
    }

    static void BotOnMessageReceived(Message message) {
        Console.WriteLine($"Receive message type: {message.Type}, Chat Id: {message.Chat.Id}");

        if (message.Type != MessageType.Text)
            return;

        Console.WriteLine( $"Received {message.Text}");
    }
}