using System;

using System.Collections.Generic;

using Newtonsoft.Json;

​

public class ListContainingObject

{

    public List<Member> AccountDetails;

}

​

public class Member

{

    public long InNumber;

    public long OutNumber;

}

​

public class Program

{

    public static void Main()

    {

        var jsontext = @" {

  ""AccountDetails"": [

    {

      ""InNumber"": ""123453333"",

      ""OutNumber"": ""125666666""

    },

    {

      ""InNumber"": ""2345543334"",

      ""OutNumber"": ""4556666667""

    },

    {

      ""InNumber"": ""9793543333"",

      ""OutNumber"": ""2345543333""

    }

  ]

} ";

        var listcontainingobject = JsonConvert.DeserializeObject<ListContainingObject>(jsontext);

        foreach(Member y in listcontainingobject.AccountDetails)

        {

            Console.WriteLine(y.InNumber);

        }

    }

}