using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using System;

using System.IO;

using System.Net;

using System.Threading.Tasks;

using System.Xml.Linq;

using System.Collections.Generic;

using System.Linq;

​

​

public class Program

{

    public static void Main()

    {

        dynamic j = Task.Run(() => JObject.Parse("{ \"data\": [] }")).Result;

        dynamic userId = j?.data.Count > 0 ? j?.data?[0]?.id : string.Empty;

        Console.WriteLine(userId);

    }

}