using System;

using System.Collections.Generic;

using Newtonsoft.Json;

public class Program

{

    public class Users

    {

        public string username { get; set; }

        public string firstName { get; set; }

        public string lastName { get; set; }

        public string email { get; set; }

    }

    public class RootUsers

    {

        public string status { get; set; }          

        public List<Users> data { get; set; }

    }

    public static void Main()

    {       

        dynamic usercollectionWrapper = new

        {

            add = new RootUsers()

            {

                status = "success",         

                data = new List<Users>

                {    

                    new Users()

                    {

                        username= "alan", firstName= "Alan", lastName= "Johnson", email= "alan@test.com"

                    },

                    new Users()

                    {

                        username= "allison", firstName= "Allison", lastName= "House", email= "al@test.com"

                    },

                    new Users() 

                    { 

                        username= "ryan", firstName= "Ryan", lastName= "Carson", email= "ryan@test.com" 

                    }

                }

            }

        };

        var output = JsonConvert.SerializeObject(usercollectionWrapper);

        Console.Write(output);

    }

}