using System;

using System.Threading.Tasks;

using Newtonsoft.Json;

​

namespace StackOverflow 

{

    public class Program

    {

        public static async Task Main(string[] args)

        {

            var result = Data;

            var data = JsonConvert.DeserializeObject<StackOverflow.ReponseResult<StackOverflow.HandHeldResult>>(result).Data;

            Console.WriteLine(data.IMEI);

        }

​

        const string Data = @"{

    ""Ok"":true,

    ""RecordCount"":118,

    ""Error"":null,

    ""InnerExceptionMessage"":null,

    ""ExecutionMessage"":""ExecutionMessage40f96da6-ae4d-41a4-b98d-5e49021959d7"",

    ""Data"":{

       ""HandHeldId"":68,

       ""ParkingAttendantId"":92,

       ""IMEI"":""IMEI220d7976-f806-4ba7-ad06-e79bc6227f64"",

       ""HandHeldAppId"":""HandHeldAppId7cc85661-4d7d-4d78-a7d8-f183de88b627"",

       ""SerialNumber"":""SerialNumber063573ec-bcf6-408b-934f-0834d8824bca"",

       ""PhoneNumber"":""PhoneNumber639f894e-4dd7-4e24-899d-a28f031331d6"",

       ""PrinterSerialNo"":""PrinterSerialNoaf0d0082-5b21-476f-8cb8-c6c9f53d81a3"",

       ""LastSeenDateTime"":""2019-10-08T20:43:05.829758+01:00"",

       ""LastPrintDateTime"":""2022-11-01T05:39:58.3454711+00:00"",

       ""IsActive"":true,

       ""IsDeleted"":false,

       ""CreatedBy"":87,

       ""UpdatedBy"":16,

       ""CreatedDateTimeUtc"":""2022-05-30T04:22:53.2192713+01:00"",

       ""UpdatedDateTimeUtc"":""2019-12-16T03:06:14.3078736+00:00"",

       ""testField"":247

     }

    }";

    }

    public class ReponseResult<T>

    {

        public bool Ok { get; set; }

        public int RecordCount { get; set; }

        public string Error { get; set; }

        public string InnerExceptionMessage { get; set; }

        public string ExecutionMessage { get; set; }

        public T Data { get; set; }

    }

​

    public class HandHeldResult

    {

        public int HandHeldId { get; set; }

​

        public int ParkingAttendantId { get; set; }

​

        public string IMEI { get; set; }

​

        // ...

    }

}