using System;

​

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var object1 = new   { 

                                Name = "12313",

                                surname = "dasdadasd",

                                lowlevel =new  { 

                                    subNAme= "asdasd"

                                }

                             };

        var json = JsonConvert.SerializeObject(object1, Formatting.Indented);

        Console.WriteLine(json);

    }

}