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class SMSSender
    {
        const string API_URL = "http://api.sms****.ru/?";
        string base_URL = "";
        private string _email;
        private string _password;
        XmlDocument doc = new XmlDocument();
        Dictionary<string,string> parameters;

        public SMSSender(string email, string password)
        {
            _email = email;
            _password = password;
            base_URL = API_URL + "email=" + _email + "&password=" + _password + "&";
        }

        public bool LoginAttempt()
        {
            parameters = new Dictionary<string, string>();
            parameters.Add("method", "login");
            return APIRequest(parameters);
        }

        public KeyValuePair<int,object> GetCreditsLeft()
        {
            parameters = new Dictionary<string, string>();
            parameters.Add("method", "get_profie");
            APIRequest(parameters);
            return new KeyValuePair<int, object>(0, int.Parse(GetValueByName("credits")));
        }

        public int SendSMS(string senderName, string internationalNumber, string text)
        {
            parameters = new Dictionary<string, string>();
            parameters.Add("method", "push_msg");
            parameters.Add("text", text);
            parameters.Add("phone", internationalNumber);
            parameters.Add("sender_name", senderName);
            APIRequest(parameters);
            return int.Parse(GetValueByName("n_raw_sms"));
        }

        public KeyValuePair<int, object> GetLastError()
        {
            return new KeyValuePair<int, object>(int.Parse(doc.GetElementsByTagName("err_code")[0].InnerText), doc.GetElementsByTagName("text")[0].InnerText);
        }

        private string GetValueByName(string keyToReturn)
        {
            return doc.GetElementsByTagName(keyToReturn)[0].InnerText;
        }

        private bool APIRequest(Dictionary<string, string> param)
        {
            string URL = base_URL;
            foreach (KeyValuePair<string, string> p in param)
                URL = URL + p.Key + "=" + p.Value + "&";
            doc.Load(URL);
            if (GetLastError().Key == 0) return true;
            else throw new SMSSenderException(GetLastError().Key, GetLastError().Value.ToString());
        }
    }

    class SMSSenderException : Exception
    {
        int _errorCode;
        string _Message;
        public SMSSenderException(int errorCode, string Message)
        {
            _errorCode = errorCode;
            _Message = Message;
        }

        public int ErrorCode
        {
            get { return _errorCode; }
        }

        override public string Message
        {
            get { return _Message; }
        }
    }
}