class SurroundingClass
{
    private bool OpenUrl(string Url, int indexCodice)
    {
        try
        {
            WebBrowser1.Navigate(Url);
            WaitForPageLoad();
            HtmlElement TextBox1 = WebBrowser1.Document.All.Item(ID_CAMPO_DI_TESTO_NEL_SITO);
            TextBox1.InnerText = CodiciDataTable.Rows(indexCodice).Item(0);
            WebBrowser1.Document.All("button").InvokeMember("click");
            WaitForPageLoad();
            return true;
        }
        catch (Exception ex)
        {
            return false;
        }
    }

    private void WaitForPageLoad()
    {
        WebBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(PageWaiter);
        while (!pageready)
            System.Windows.Forms.Application.DoEvents();
        pageready = false;
    }

    private void PageWaiter(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        if (WebBrowser1.ReadyState == WebBrowserReadyState.Complete)
        {
            pageready = true;
            WebBrowser1.DocumentCompleted -= new WebBrowserDocumentCompletedEventHandler(PageWaiter);
        }
    }

    private void EstraiDati()
    {
        while (OpenUrl(Url, indexCodice))
        {
            req = WebRequest.Create(WebBrowser1.Url.ToString());
            using (WebResponse resp = req.GetResponse())
            {
                using (StreamReader reader = new StreamReader(resp.GetResponseStream()))
                {
                    source = reader.ReadToEnd();
                }
            }
        }
    }
}