Алексей Игошев

Вот класс бота для Telegram, если вдруг кому-нибудь понадобиться:

class TelegramBot
    {
        private string Token;
        private byte[] Buffer = new byte[8192];
        
        private HttpWebResponse Response;
        private Stream ResponseStream;

        private static Timer TimeListen;

        public TelegramUpdates Update;
        public int GlobalOffset;
        

        StringBuilder ResposeString= new StringBuilder();


        public TelegramBot(string InputToken)
        {
            Token = InputToken;

            TimeListen = new Timer(Listen, null, 0, 500);

            try
            {
                GlobalOffset = Convert.ToInt32(File.ReadAllText(@"..\OffsetKey.txt"));

                GlobalOffset += 1;
            }

            catch
            {

                MessageBox.Show("Error file read");
            }
        }

        public void SendMessage(string InputMessage)
        {

            WebRequest Request = (HttpWebRequest)WebRequest.Create("https://api.telegram.org/bot" + Token + "/sendMessage?chat_id=228451619&text="+InputMessage+"");
            Response = (HttpWebResponse)Request.GetResponse();
            Request.Abort();
            
        }

        public string GetResponse()
        {
            ResposeString.Clear();
            ResponseStream = Response.GetResponseStream();

            string tempString = null;
            int count = 0;


            do
            {
               
                count = ResponseStream.Read(Buffer, 0, Buffer.Length);
                if (count != 0)
                {
                   tempString = Encoding.ASCII.GetString(Buffer, 0, count);
                   ResposeString.Append(tempString);
                }
            } while (count > 0);

            
            return ResposeString.ToString();
        }

        public void GetUpdates(int InputOffset)
        {
            WebRequest Request = (HttpWebRequest)WebRequest.Create("https://api.telegram.org/bot" + Token + "/getUpdates?offset="+InputOffset+"");
            Response = (HttpWebResponse)Request.GetResponse();
        }

        private void Listen(object state)
        {
            GetUpdates(GlobalOffset);
            try
            {
                Update = JsonConvert.DeserializeObject<TelegramUpdates>(GetResponse());
                if (Update.result[0].message.text != "")
                {

                    
                    File.WriteAllText(@"..\OffsetKey.txt", GlobalOffset.ToString());

                    GlobalOffset += 1;


                    #region BotLogic

                    if (Update.result[0].message.text == "h") SendMessage("Hello");

                    #endregion
                }

            }

            catch
            {

              

            }



        }

    }

P.S: предложения по улучшению оставляйте в комментариях.