Group scanner fast

internal class GroupScanner
    {
        private readonly Random _groupnumberGenerator;

        public GroupScanner()
        {
            _groupnumberGenerator = new Random();
        }

        public void Initialize(int userSpecifiedTaskAmount)
        {
            ParallelOptions options = new ParallelOptions();
            options.MaxDegreeOfParallelism = userSpecifiedTaskAmount;
            Parallel.For(0, Int32.MaxValue, options, (p) =>
            {
                MainScan();
            });
        }

        private async void MainScan()
        {
            HtmlDocument htmlDocument = new HtmlDocument();
            string link = $"https://www.roblox.com/Groups/Group.aspx?gid={_groupnumberGenerator.Next(1300000)}";
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(link);

            using (HttpWebResponse response = (HttpWebResponse)await request.GetResponseAsync())
                if (response != null && response.StatusCode == HttpStatusCode.OK)
                    using (StreamReader sr = new StreamReader(response.GetResponseStream()))
                        htmlDocument.LoadHtml(await sr.ReadToEndAsync());

            request = null;

            if (htmlDocument.GetElementbyId("MemberCount") != null
                && htmlDocument.GetElementbyId("MemberCount").InnerText.Equals("Members: 0"))
            {
                if (htmlDocument.GetElementbyId("ctl00_cphRoblox_rbxGroupFundsPane_GroupFunds") != null)
                {
                    uint amount = uint.Parse(htmlDocument.GetElementbyId("ctl00_cphRoblox_rbxGroupFundsPane_GroupFunds").ChildNodes[3].InnerText, NumberStyles.AllowThousands);
                    if (amount != 0)
                        Console.WriteLine($"Group Link: {link} | Robux: {amount}");
                }
            }
        }
    }