using System;

using System.Collections.Generic;

using System.Linq;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

            var json =    @"[{ 'id_product':33681,'Brand':'Ikea','Product':'STOCKHOLM Tv-meubel'}, 

                        {'id_product':33681,'Brand':'Ikea','Product':'STOCKHOLM Kast'},

                        { 'id_product':33685,'Brand':'Ikea','Product':'EKENÄS Fauteuil'}]";                         

    var products = JsonConvert.DeserializeObject<List<Products>>(json);

    var results = products.Where(a => a.IdProduct == 33681).ToList();

    results.Dump();

    }

    public class Products

{

    [JsonProperty("id_product")]

    public int IdProduct {get;set;}

​

    [JsonProperty("Brand")]

    public string Brand { get; set; }

​

    [JsonProperty("Product")]

    public string Product { get; set; }

}

}