how to get value in this row

Question

i want to get this binding value with Row_Click Events,but it doesn't work.help

private void Row_Click(object sender, RoutedEventArgs e) { RadButton b = e.OriginalSource as RadButton; string guid = b.DataContext.ToString(); int type=1;

        if (((Silverlight.BindableObject)(this.grvinfo.SelectedItem)).GetValue("ty").ToString() == "2")
        {
            type = 2;
        }
        CheckMail _mail = new CheckMail(guid, type);
        _mail.Show();
    }