using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq; 

​

public class Program

{

    public static void Main()

    {

                    string us = @"[

  {

    ""linktext"": ""pk"",

    ""linkurl"": ""https://""

  },

  {

    ""linktext"": ""it"",

    ""linkurl"": ""http://kp1ua""

  },

  {

    ""linktext"": ""tb"",

    ""linkurl"": ""http://kp1u2""

  },

  {

    ""linktext"": ""alex"",

    ""linkurl"": ""http://kp1u""

  }

]";

                            string it = @"

​

                {

                  ""linktext"": ""alex"",

                  ""linkurl"": ""http://kp1u""

                }

                    ";

​

            dynamic userFavorites = JArray.Parse(us);

            dynamic item = JObject.Parse(it);

​

            userFavorites.Remove(item);

​

            Console.WriteLine(userFavorites.GetType());

            Console.WriteLine(item.GetType());

            Console.WriteLine(userFavorites);

​

    }

}