using System;

using System.Net;

using System.IO;

using HtmlAgilityPack;

using Newtonsoft.Json.Linq;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var req = (HttpWebRequest) WebRequest.Create("https://www.vietlott.vn/ajaxpro/Vietlott.PlugIn.WebParts.Game645CompareWebPart,Vietlott.PlugIn.WebParts.ashx");

        req.KeepAlive = true;

        req.ContentType = "text/plain; charset=UTF-8";

        req.UserAgent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/96.0.4664.110 Safari/537.36";

        req.Accept = "*/*";

        req.Referer = "https://www.vietlott.vn/vi/trung-thuong/ket-qua-trung-thuong/winning-number-645";

        req.Headers.Add("sec-ch-ua", "\" Not A;Brand\";v=\"99\", \"Chromium\";v=\"96\", \"Google Chrome\";v=\"96\"");

        req.Headers.Add("X-AjaxPro-Method", "ServerSideDrawResult");

        req.Headers.Add("sec-ch-ua-mobile", "?0");

        req.Headers.Add("sec-ch-ua-platform", "\"Windows\"");

        req.Headers.Add("Origin", "https://www.vietlott.vn");

        req.Headers.Add("Sec-Fetch-Site", "same-origin");

        req.Headers.Add("Sec-Fetch-Mode", "cors");

        req.Headers.Add("Sec-Fetch-Dest", "empty");

        req.Headers.Add("Accept-Language", "en,vi;q=0.9");

        req.Headers.Add("Cookie", "_ga=GA1.2.532915416.1640764270; _gid=GA1.2.504687538.1640764270; _gat_gtag_UA_42453093_1=1");

        req.Method = "POST";

        var reqs = req.GetRequestStream();

        using (var wt = new StreamWriter(reqs))

            wt.Write("{\r\n    \"ORenderInfo\": {\r\n        \"SiteId\": \"main.frontend.vi\",\r\n        \"SiteAlias\": \"main.vi\",\r\n        \"UserSessionId\": \"\",\r\n        \"SiteLang\": \"vi\",\r\n        \"IsPageDesign\": false,\r\n        \"ExtraParam1\": \"\",\r\n        \"ExtraParam2\": \"\",\r\n        \"ExtraParam3\": \"\",\r\n        \"SiteURL\": \"\",\r\n        \"WebPage\": null,\r\n        \"SiteName\": \"Vietlott\",\r\n        \"OrgPageAlias\": null,\r\n        \"PageAlias\": null,\r\n        \"FullPageAlias\": null,\r\n        \"RefKey\": null,\r\n        \"System\": 1\r\n    },\r\n    \"Key\": \"6133a14f\",\r\n    \"GameDrawId\": \"\",\r\n    \"ArrayNumbers\": [\r\n        [\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\"\r\n        ],\r\n        [\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\"\r\n        ],\r\n        [\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\"\r\n        ],\r\n        [\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\"\r\n        ],\r\n        [\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\"\r\n        ],\r\n        [\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\",\r\n            \"\"\r\n        ]\r\n    ],\r\n    \"CheckMulti\": false,\r\n    \"PageIndex\": 0\r\n}");

        var resp = req.GetResponse();

        var ress = resp.GetResponseStream();

        var json = "";

        using (var rd = new StreamReader(ress))

            json = rd.ReadToEnd();

        var html = JObject.Parse(json).SelectToken("$.value.HtmlContent").ToString();

        var doc = new HtmlDocument();

        doc.LoadHtml(html);

        foreach (var tr in doc.DocumentNode.Descendants().Where(x => x.Name == "tr"))

        {

            foreach (var td in tr.Descendants().Where(x => x.Name == "td"))

                Console.WriteLine(td.InnerText.Trim());

            Console.WriteLine("=====");

        }

    }

}