c# webbrowser write html to text file

//Create the WebBrowser control
WebBrowser wb = new WebBrowser();
//Add a new event to process document when download is completed   
wb.DocumentCompleted +=
    new WebBrowserDocumentCompletedEventHandler(DisplayText);
//Download the webpage
wb.Url = urlPath;

private void DisplayText(object sender, WebBrowserDocumentCompletedEventArgs e)
{
WebBrowser wb = (WebBrowser)sender;
wb.Document.ExecCommand("SelectAll", false, null);
wb.Document.ExecCommand("Copy", false, null);
textResultsBox.Text = CleanText(Clipboard.GetText());
}