How to get form input using HtmlAgilityPack without getting a zero link error?

Question

How can I extract the second set of input nodes after <br>from the HTML form below?

When I try the following, I do not receive input nodes.

HtmlNode.ElementsFlags.Remove("form");
HtmlNode formNode = doc.DocumentNode.SelectNodes("//form")[0];
foreach (HtmlNode innode in formNode.Elements("input"))
{
 ...
}

HTML

<form>
  <div>
    <input type="submit" value="subv1" name="subn1">
  </div>
  <script></script>
  <table></table>
  <table></table>
  <br>
  <input type="hidden" value="v1" name="n1">
  <input type="hidden" value="v2" name="n2">
  <input type="submit" value="subv2" name="subn2">
</form>  

Answer 1

Call HtmlNode.ElementsFlags.Remove("form")before loading the document. The following works great:

public static void Main()
{
    HtmlNode.ElementsFlags.Remove("form");

    var doc = new HtmlDocument();
    doc.Load("HtmlPage1.html");

    HtmlNode formNode = doc.DocumentNode.SelectNodes("//form")[0];
    foreach (HtmlNode innode in formNode.Elements("input"))
    {
        Console.WriteLine(innode.OuterHtml);
    }

    Console.WriteLine("Press Enter to exit...");
    Console.ReadLine();
}