using System;

using System.Collections.Generic;

using System.Linq;

using System.Xml;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = "{\"formname\":[\"API_Test\",{\"operation\":[\"add\",{\"values\":{\"First_Name\":\"bs_CAddTest0\",\"Last_Name\":\"bs_CAddTest0\",\"ID\":1917249000799912022},\"status\":\"Success\"}]}]}\n";

        JObject o =  JObject.Parse(json);

        Console.WriteLine(o["formname"][1]["operation"][1]["values"]["First_Name"]);

        Console.WriteLine(o["formname"][1]["operation"][1]["values"]["Last_Name"]);

        Console.WriteLine(o["formname"][1]["operation"][1]["values"]["ID"]);

    }

}

​