gistfile1.cs

        private void listView_ItemClick(object sender, ItemEventArgs e)
        {
            var intent = new Intent();
            intent.SetClassName(this, PortfolioActivity.ClassName);
            intent.PutExtra(PortfolioActivity.Extra_PortfolioID, _portfolios[e.Position].ID ?? -1);
            StartActivityForResult(intent, 0);
        }