public partial class Form1 : Form
  {
    int totMeta;
    int CurrMeta;
    HtmlElementCollection metaColl;
    public Form1()
    {
      InitializeComponent();
      totMeta = 0;
      CurrMeta = -1;
      labCurrMeta.Text = "-";
      labTotMeta.Text = totMeta.ToString();
      buttonBelandi.Enabled = false;
      this.Invalidate();
    }

    private void buttonNaviga_Click(object sender, EventArgs e)
    {
      wb.Navigate("www.sito.it");
    }

    private void wb_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
      checkBoxDC.Checked = true;
      ContaMetaTotali();
      UpdateTotMetaLabel();
      buttonBelandi.Enabled = true;
    }

    private void UpdateTotMetaLabel()
    {
      labTotMeta.Text = totMeta.ToString();
      labTotMeta.Invalidate();
    }
    /// <summary>
    /// Qui riempio le variabili di classe che permettono l'automazione dei button e le visualizzazioni
    /// </summary>
    private void ContaMetaTotali()
    {
      HtmlDocument doc = wb.Document;
      metaColl = doc.GetElementsByTagName("meta");
      totMeta = metaColl.Count;
    }

    private void wb_Navigating(object sender, WebBrowserNavigatingEventArgs e)
    {
      checkBoxDC.Checked = false;
    }

    private void buttonPrev_Click(object sender, EventArgs e)
    {
      if (CurrMeta < 0)
        return;
      else
      {
        CurrMeta--;
        UpdateLabels(CurrMeta);
      }
    }

    private void UpdateLabels(int CurrMeta)
    {
      if (CurrMeta >= 0 && CurrMeta < metaColl.Count)
      {
        string description = metaColl[CurrMeta].GetAttribute("name").ToString();
        string content = metaColl[CurrMeta].GetAttribute("content").ToString();
        txtContent.Text = content;
        labCurrMeta.Text = CurrMeta.ToString();
        txtDesc.Text = description;
        txtDesc.Invalidate();
        labCurrMeta.Invalidate();
        txtContent.Invalidate();
      }
    }

    private void buttonSucc_Click(object sender, EventArgs e)
    {
      if (CurrMeta < metaColl.Count-1)
      {
        CurrMeta++;
        UpdateLabels(CurrMeta);
      }
      else
        return;
    }

    private void buttonBelandi_Click(object sender, EventArgs e)
    {
      foreach (HtmlElement elem in metaColl)
      {
        string attrib = elem.GetAttribute("name");
        if (attrib != null)
          if (attrib.ToLower().Contains("keywords"))
          {
            txtKW.Text = elem.GetAttribute("content").ToString();
            txtKW.Invalidate();
            break;
          }
      }
    }
  }