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private void tellow()
{
    string Telefon = textBox1.Text;
    HtmlAgilityPack.HtmlWeb tello = new HtmlAgilityPack.HtmlWeb();
    HtmlAgilityPack.HtmlDocument doctello = tello.Load("https://www.tellows.de/num/" + Telefon);

    var HeaderNamestello = doctello.DocumentNode
             .SelectNodes("//div[@id='tellowsscore']").ToList();

    foreach (var item in HeaderNamestello)
    {
        string suchworttello = "6";
        string outerHtmltello = item.OuterHtml;
        bool Spam_gefunden = outerHtmltello.Contains(suchworttello);
    }