C# Code Only Getting Pagesource For Visible Page, Not For Scrolled Down Page

If you go to http://dota-trade.com/equipment?order=name and scroll down, you can see that if you scroll down to the bottom of the page, it loads more items. The following code grab

Solution 1:

using HtmlAgilityPack;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication5
{
    class Program
    {
        static void Main(string[] args)
        {
            WebClient wc = new WebClient();
            var sourceCode = wc.DownloadString("http://dota-trade.com/equipment?order=name");
            HtmlDocument doc = new HtmlDocument();
            doc.LoadHtml(sourceCode);
            var node = doc.DocumentNode;
            var nodes = node.SelectNodes("//a");
            List<string> links = new List<string>();
            foreach (var item in nodes)
            {
                var link = item.Attributes["href"].Value;
                links.Add(link.Contains("http") ? link : "http://dota-trade.com" +link);
            }
            int index = 1;
            while (true)
            {
                sourceCode = wc.DownloadString("http://dota-trade.com/equipment?order=name&offset=" + index.ToString());
                doc = new HtmlDocument();
                doc.LoadHtml(sourceCode);
                node = doc.DocumentNode;
                nodes = node.SelectNodes("//a");
                var cont = node.SelectSingleNode("//tr[@itemtype='http://schema.org/Thing']");
                if (cont == null) break; 
                foreach (var item in nodes)
                {
                    var link = item.Attributes["href"].Value;
                    links.Add(link.Contains("http") ? link : "http://dota-trade.com" + link);
                }
                index++;
            }
            System.IO.File.WriteAllLines(@"C:\Users\Public\WriteLines.txt", links);
        }
    }
}