C#: Best way to inject CSS into MSHTML instance?

Question

I\'m trying to inject some CSS that accompanies some other HTML into a C# managed WebBrowser control. I am trying to do this via the underlying MSHTML (DomDocument property)

Answer 1

Ended up solving this myself:

mshtml.HTMLDocument test = (mshtml.HTMLDocument)webBrowser1.Document.DomDocument;

//inject CSS
if (test.styleSheets.length < 31) { // createStyleSheet throws "Invalid Argument if >31 stylesheets on page

    mshtml.IHTMLStyleSheet css = (mshtml.IHTMLStyleSheet)test.createStyleSheet("", 0);
    css.cssText = myDataClass.returnInjectionCSS(); // String containing CSS to inject into the page
        // CSS should now affect page

} else {
    System.Console.WriteLine("Could not inject CSS due to styleSheets.length > 31");
    return;
}

What I didn't realize is that createStyleSheet creates a pointer that is still 'live' in the document's DOM... therefore you don't need to append your created stylesheet back to its parent. I ended up figuring this out by studying dynamic CSS code for Javascript as the implementations are pretty much identical.