public ApiResponseOperations Calculate(string contractType, string salary)
        {
            string api = $"{urlApi}/GetSalary/{contractType}/{salary}";

            var request = (HttpWebRequest)WebRequest.Create(api);

            request.Method    = "GET";
            request.UserAgent = "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36";
            request.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip;

            var response = (HttpWebResponse)request.GetResponse();

            string content = string.Empty;

            using (var stream = response.GetResponseStream())
            {
                using (var sr = new StreamReader(stream))
                {
                    content = sr.ReadToEnd();
                }
            }

            string result             = string.Empty;
            JavaScriptSerializer  js  = new JavaScriptSerializer();
            ApiResponseOperations con = js.Deserialize <ApiResponseOperations>(content);

            return(con);
        }
        public ApiResponseOperations GetSalary(string contractTypeName, string salary)
        {
            ApiResponseOperations response = new ApiResponseOperations();

            try
            {
                decimal      result        = 0;
                decimal      sa            = Convert.ToDecimal(salary);
                const string contractHour  = "HourlySalaryEmployee";
                const string contractMonth = "MonthlySalaryEmployee";

                switch (contractTypeName)
                {
                case contractHour:
                    var calH = new CalculateHourlySalary();
                    result = calH.Calculate(sa);
                    break;

                case contractMonth:
                    var calM = new CalculateMonthlySalary();
                    result = calM.Calculate(sa);
                    break;
                }

                response.Data    = result;
                response.Message = "OK";
                response.Success = true;
            }
            catch (Exception ex)
            {
                response.Message = $"Error: {ex.Message}";
                response.Success = false;
            }

            return(response);
        }