How can I manipulate the DOM from a string of HTML in C#?

JasonBunting already posted this, but it really works to use a .net wrapper around HTML tidy and load it up in an XmlDocument.

I have used this .net wrapper before :

http://www.codeproject.com/KB/cs/ZetaHtmlTidy.aspx

And implemented it somewhat like this:

string input = "<p>crappy html<br <img src=foo></div>";
HtmlTidy tidy = new HtmlTidy()
string output = tidy.CleanHtml(input, HtmlTidyOptions.ConvertToXhtml);
XmlDocument doc = new XmlDocument();
doc.LoadXml(output);

Sorry if considered a repost :)

I did a search to GooglePlex for HTML and I found Html Agility Pack I do not know if it's for that or not, I am downloading it right now to give a try.

Depending on what you are trying to do (maybe you can give us more details?) and depending on whether or not the HTML is well-formed, you could convert this to an XmlDocument:

System.Xml.XmlDocument x = new System.Xml.XmlDocument();
x.LoadXml(html); // as long as html is well-formed, i.e. XHTML

Then you could manipulate it easily, without the WebBrowser instance. As for threads, I don't know enough about the implementation of XmlDocument to know the answer to that part.

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If the document isn't in proper form, you could use NTidy (.NET wrapper for HTML Tidy) to get it in shape first; I had to do this very thing for a project once and it really wasn't too bad.