using System;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"

            [

              {

                ""name"": ""sam"",

                ""age"": 19,

                ""Gender"": ""F"",

                ""Email"": ""sam@test.com"",

                ""PhoneNumber"": {

                  ""CCode"": ""1"",

                  ""Area"": ""123"",

                  ""PhoneNum"": ""456-789"",

                  ""PhoneExtn"": """"

                }

              }

            ]";

        PhoneNumberModel model =

            JArray.Parse(json)[0]

                  .SelectToken("PhoneNumber")

                  .ToObject<PhoneNumberModel>();

        Console.WriteLine(string.Format("{0}-{1}-{2}", model.CCode, model.Area, model.PhoneNum));

    }

}

​

class PhoneNumberModel

{

    public string CCode { get; set; }

    public string Area { get; set; }

    public string PhoneNum { get; set; }

    public string PhoneExtn { get; set; }

}

​