public async override void Execute(ITelegramBotClient botClient, Message message = null, string args = "") { var ids = System.IO.File.ReadAllLines("Files/Chats.txt"); if (ids.Contains(message.Chat.Id.ToString())) { await botClient.SendTextMessageAsync(message.Chat.Id, "You're already being notified."); } else { botClient.AddChat(message.Chat.Id); await botClient.SendTextMessageAsync(message.Chat.Id, "From now on you will be notified each time a vpnbook password changes."); } }