You can use a tool to help Htmlagility that would be the Fizzler
!!
it has the same purpose as the Htmlagility however in it you can do "query’s" in your object to catch the desired element,
you can download the Fizzler on nuget even,
and it would work like this
WebClient wc = new WebClient();
wc.Headers.Add(HttpRequestHeader.UserAgent, "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36");
string pag = wc.DownloadString("pagina de onde você quer pegar a informação");
HtmlDocument doc = new HtmlDocument();
doc.LoadHtml2(pag);
var tabela = doc.DocumentNode.QuerySelectorAll("tags do queryselector").ToList();
you can search a little more about the tags of the queryselector more the basic would be
"#" = ID of the element,
"." = element class,
and the tags of s elements in html normally!
I didn’t quite understand the question. Do you want to pass that content that’s inside the TH element to a list ? Is that it ? You have one or more tables in your html ?
– Pedro