Calling Webservice in C# for JSON Data

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net;
using System.Text;
using System.IO;
using System.Web.Services;
using System.Web.Script.Services;
using System.Web.Script.Serialization;
using Newtonsoft.Json.Linq;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        CallWebService();
    }
    private void CallWebService()
    {
        StringBuilder str = new StringBuilder();
        string url = "Put your Service url";
        WebRequest request = WebRequest.Create(url);
        using (WebResponse response = (HttpWebResponse)request.GetResponse())
        {
            using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
            {
                string json = reader.ReadToEnd();
                var serializer = new JavaScriptSerializer();
                var objects = JArray.Parse(json);
                str.Append("<table>");
                foreach (JObject root in objects)
                {
                    string id = "";
                    string title = "";
                    string date = "";
                    string longdesc = "";

                    foreach (KeyValuePair<String, JToken> app in root)
                    {
                        if (app.Key == "id") id = app.Value.ToString();
                        if (app.Key == "title") title = app.Value.ToString();
                        if (app.Key == "date") date = app.Value.ToString();
                        if (app.Key == "longdesc") longdesc = app.Value.ToString();
                    }
                    str.Append("<tr><td><h1>" + title + "</h1></td></tr>");
                    str.Append("<tr><td>" + date + "</td></tr>");
                    str.Append("<tr><td>" + longdesc + "</td></tr>");

                }
                str.Append("</table>");
                //---------Social Sharing
                divShare.InnerHtml = str.ToString();
            }
        }
    }
}