HubspotController.Form.cs

public ActionResult Form()
    {
      var dataSourceId = RenderingContext.CurrentOrNull.Rendering.DataSource;
      var dataSource = Sitecore.Context.Database.Items.GetItem(dataSourceId);
      if (dataSource == null)
      {
        return View();
      }

      var hubspotFormSettings = GetHubspotSettingsModel(dataSource);
      return View(hubspotFormSettings);

    }