using System;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        dynamic dynamicObject = new {

          a = new int[] {1, 2},

          b = "String val",

          c = 10,

          d = new { sa = 1, sb = "abv", sc = new int[] { 1, 2, 3 } }

        };

        // Add new props

const string newProp = "e";

dynamicObject[newProp] = "New val";

dynamicObject.f = false;

​

dynamicObject["d"]["sd"] = null;

dynamicObject["d"].se = null;

​

// Modify props

const string prop = "a";

dynamicObject[prop].push(3);

dynamicObject.b += " ABCD";

​

// Modify children props of another prop

dynamicObject.d.sb = new string[] { "New", "Array" };

dynamicObject.d["sa"] += 5;

​

dynamicObject["d"]["sa"] += 5;

          string result = JsonConvert.SerializeObject(dynamicObject);

        Console.WriteLine(result);

    }

}