private string GetSelection()
        {
            IHTMLDocument2 doc = (IHTMLDocument2)browserInstance.Document;
            IHTMLSelectionObject sel = doc.selection;
            IHTMLTxtRange range = (IHTMLTxtRange)sel.createRange();
            return range.text;
        }
        private bool FindFirst(string text)
        {
            IHTMLDocument2 doc = (IHTMLDocument2)browserInstance.Document;
            IHTMLSelectionObject sel = (IHTMLSelectionObject)doc.selection;
            sel.empty(); // get an empty selection, so we start from the beginning
            IHTMLTxtRange rng = (IHTMLTxtRange)sel.createRange();
            if (rng.findText(text, 1000000000, 0))
            {
                rng.select();
                return true;
            }
 
            return false;
        }
        private bool FindNext(string text)
        {
            IHTMLDocument2 doc = (IHTMLDocument2)browserInstance.Document;
            IHTMLSelectionObject sel = (IHTMLSelectionObject)doc.selection;
            IHTMLTxtRange rng = (IHTMLTxtRange)sel.createRange();
            rng.collapse(false); // collapse the current selection so we start from the end of the previous range
            if (rng.findText(text, 1000000000, 0))
            {
                rng.select();
                return true;
            }
 
            return false;
        }