using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Serialization;

public class Program

{

    class Person 

    {

        public string FirstName {get;set;}

        public string LastName {get;set;}

    }

    public static void Main()

    {

        var person = new Person(){FirstName = "Minh", LastName = "Đinh"};

        var ex = new Exception("asdasd");

        var result = ConvertObjectToCamelJson(ex);

        Console.WriteLine(result);

    }

    public static string ConvertObjectToCamelJson(object obj){

        var settings = new JsonSerializerSettings

        {

            ContractResolver = new CamelCasePropertyNamesContractResolver()

        };

        return JsonConvert.SerializeObject(obj, settings);

    }

}