using System;

using System.Collections.Generic;

using System.Linq;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        string json = @"{  ""CISumInsured"": 150000,   ""Frequency"": ""Monthly"",   ""Smoker"": ""No"",   ""Weight"": ""60"",   ""Height"": ""160"",   ""BMIRatio"": ""23.44"",   ""IsMailingAddressSameHomeAddress"": ""Yes"",   ""IsMalaysian"": ""No"",   ""Relationship"": ""Self"",   ""AgentCode"": null }";

        var dynaData = JsonConvert.DeserializeObject<Dictionary<string, dynamic>>(json);

​

        Console.WriteLine(dynaData.Where(x => x.Key == "AgentCode").First().Value.ToLower());

        /*

        foreach (var rowDyna in dynaData)

        {

            if (rowDyna.Key.ToLower() == "smoker" && rowDyna.Value.ToLower() == "yes")

                replaceData.Add(string.Format("$Extension/{0}$", rowDyna.Key), "Y");

            else if (rowDyna.Key.ToLower() == "smoker" && rowDyna.Value.ToLower() == "no")

                replaceData.Add(string.Format("$Extension/{0}$", rowDyna.Key), "N");

            else if (rowDyna.Key.ToLower() == "relationship" && rowDyna.Value.ToLower() == "null")

                replaceData.Add(string.Format("$Extension/{0}$", rowDyna.Key), string.Empty);

            else

                replaceData.Add(string.Format("$Extension/{0}$", rowDyna.Key), rowDyna.Value.ToString());

        }

        */

    }

}