/// <summary>
        /// Method to sort most populated states.
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="jsonFilepath"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string ReturnDataNumberOfStatesHighestSortCSVFileAndWriteInJson(string filePath, string jsonFilepath, string key)
        {
            string        readFile      = File.ReadAllText(filePath);
            StringBuilder stringbuilder = new StringBuilder();

            using (var reader = ChoCSVReader.LoadText(readFile)
                                .WithFirstLineHeader())
            {
                using (var writer = new ChoJSONWriter(stringbuilder)) writer.Write(reader);
            }
            File.WriteAllText(jsonFilepath, stringbuilder.ToString());
            JArray array     = CsvStateCensusReadRecord.SortJsonBasedOnKeyAndValueIsNumber(jsonFilepath, key);
            var    jsonArray = JsonConvert.SerializeObject(array, Formatting.Indented);

            File.WriteAllText(jsonFilepath, jsonArray);
            return(CsvStateCensusReadRecord.RetriveLastDataOnKey(jsonFilepath, key));
        }
        /// <summary>
        /// Method to return/show the last state data from json file.
        /// </summary>
        /// <param name="filePath"></param>
        /// <param name="jsonFilepath"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string SortCsvFileWriteInJsonAndReturnLastData(string filePath, string jsonFilepath, string key)
        {
            string        readFile      = File.ReadAllText(filePath);
            StringBuilder stringbuilder = new StringBuilder();

            using (var reader = ChoCSVReader.LoadText(readFile)
                                .WithFirstLineHeader())
            {
                using (var writer = new ChoJSONWriter(stringbuilder)) writer.Write(reader);
            }
            File.WriteAllText(jsonFilepath, stringbuilder.ToString());
            JArray array = CsvStateCensusReadRecord.SortingJsonBasedOnKey(jsonFilepath, key);

            // serialize JSON to a string and then write string to a file
            var jsonArray = JsonConvert.SerializeObject(array, Formatting.Indented);

            File.WriteAllText(jsonFilepath, jsonArray);
            return(CsvStateCensusReadRecord.RetriveLastDataOnKey(jsonFilepath, key));
        }