public class ClassTelegram
    {
        public string ApiToken { get; set; }
        public string ChatId { get; set; }
        public string Msg { get; set; }

        public string UrlString
        {
            get
            {
                string urlString = "https://api.telegram.org/bot{0}/sendMessage?chat_id={1}&text={2}";
                return String.Format(urlString, ApiToken, ChatId, Msg);
            }
        }

        public string Send()
        {
            try
            {
                WebRequest request = WebRequest.Create(UrlString);
                Stream rs = request.GetResponse().GetResponseStream();
                StreamReader reader = new StreamReader(rs);
                string line = "";
                StringBuilder sb = new StringBuilder();
                while (line != null)
                {
                    line = reader.ReadLine();
                    if (line != null)
                        sb.Append(line);
                }
                string response = sb.ToString();
                return response;
            }

            catch (Exception ex)
            {
                // Codice da eseguire in caso di eccezione.
                string errore;
                errore = "È avvenuta la seguente eccezione: " + System.Environment.NewLine;
                errore += ex.Message;
                return errore;
            }
        }
    }