using System;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        JObject o1 = JObject.Parse(@"{

  'FirstName': 'John',

  'LastName': 'Smith',

  'Enabled': false,

  'Roles': 'User1'

}");

JObject o2 = JObject.Parse(@"{

  'Enabled': true,

  'Roles':  'Admin'

}");

​

o1.Merge(o2, new JsonMergeSettings

{

    // union array values together to avoid duplicates

    MergeArrayHandling = MergeArrayHandling.Union

});

​

string json = o1.ToString();

        Console.WriteLine(o1);

    }

}