Listbox

Question

      AutoPostBack=true
      protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
      {
       }
        Listbox添加该事件后，Item永远选不中，SelectedIndex=-1,我想获得选中某个Item时的SelectedIndex，求各位大侠给个解决方案

Answer 1

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {        }
    }