using System;

using System.Linq;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        var jArrayString = "[{ \"frameRate\" : \"25\", \"dropFrame\": false}, { \"frameRate\" : \"25\", \"dropFrame\": false}, { \"frameRate\" : \"25\", \"dropFrame\": false}, { \"frameRate\" : \"25\", \"dropFrame\": false}]";

        var jArray = JArray.Parse(jArrayString);

        bool allSame = jArray.All(j => j["frameRate"].ToObject<string>() == jArray[0]["frameRate"].ToObject<string>());

        Console.WriteLine("allSame: " + allSame);

        Console.WriteLine("Hello World");

    }

}