Using WebBrowser in a console application

I want to use it to invoke some JS scripts on the webpage. I have this:

    static void Stuff()
    {
        WebBrowser browser = new WebBrowser();
        browser.Navigate("http://www.iana.org/domains/example/");
        HtmlDocument doc = browser.Document;
        //doc.InvokeScript("someScript");
        Console.WriteLine(doc.ToString());
    }

    static void Main(string[] args)
    {
        Console.WriteLine("hi");
        var t = new Thread(Stuff);
        t.SetApartmentState(ApartmentState.STA);
        t.Start();
    }

Question 1: I get an "object reference not set" exception when I try to get doc.ToString(). Why?

Question 2: How do I get some data from the HTML document into the main program? WebBrowser requires a separate thread, which requires a static method which can't return any value. How do I return, say, doc to the Main() so I can do something with it?