Hanging HtmlAgilityPack Task

Question

I am trying to parse an html page with HtmlAgilityPack to Extract links from it then add links to ListBox then add the links from listBox to queue.

I have three Tasks(PageParse,AddItemsToList,EnqueueFromList)

OK My problem is when I click the button the whole Application is hanging.

button Code  

private void CrawdBtn_Click(object sender, EventArgs e)
    {
        t = Task.Factory.StartNew(PageParse);
        t.Wait();
        TaskAddToList = Task.Factory.StartNew(() => AddItemsToList(t.Result));
        TaskAddToList.Wait();

        b = new Task(EnqueueFromList);
        b.Start();
        //Task.WaitAll(t,b);
        CrawdBtn.Enabled = true;

    }

Page Parse Method

public HtmlAgilityPack.HtmlDocument PageParse()
    {
        MessageBox.Show($"Page Parse Has started");

        web = new HtmlWeb();
        doc = new HtmlAgilityPack.HtmlDocument();
        doc = web.Load(UrlText.Text);



        return doc;
    }

I have Noticed by following breakpoints That the debugger is hanging when it goes to execute PageParse Method