using System;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        string a = "{\"Identifier\":\"72116\"}";

        var b = JsonConvert.DeserializeObject<dynamic>(a);

        var g = b.GetType().GetProperty("Identifier");

        var v = g.GetValue(b, null);

        int i = b["Identifier"];

        Console.WriteLine(i);

    }

}