How to display int from web page (webscraping) in TextBox

Question

I need somebody who tell me how to use Html Agility Pack in Windows Forms. I have
`private void btnOnet_Click(object sender, EventArgs e)

    {
        HtmlAgilityPack.HtmlDocument doc = new HtmlAgilityPack.HtmlDocument();
        HtmlWeb web = new HtmlWeb();
        doc = web.Load("https://pogoda.onet.pl/");
        var temperatura = doc.DocumentNode.SelectSingleNode("//div[contains(@class, 'temperature')]/div[contains(@class, 'temp')]");
        onet.Text = temperatura.InnerHtml;
    }    `   

I don't know how to display result in textBox aftek click Button. Should I create another method or do all in private void btnOnet_Click