新人报道,silverlight第一问(如何将与数据库内某表绑定的listbox的SELECT内容传递给textbox)

Question

 

生成LISTBOX内容的代码如下(将DM_BXLB表中的MC字段在listbox中列出:
void add_list(object sender, ServiceReference1.Get_bxlbCompletedEventArgs e)
{
ObservableCollection(dm_bxlb) lst = e.Result;
this.lb_lst.ItemsSource = lst;
this.lb_lst.Visibility = Visibility.Visible;
this.lb_lst.DisplayMemberPath = "mc";
}
如何写"?"处部分
private void lb_lst_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
this.bxlb.Text = ?
this.lb_lst.Visibility = Visibility.Collapsed;
}