01.protected void Page_Load(object sender, EventArgs e)
02.{
03. if (!string.IsNullOrEmpty(hd.Value))
04. ddl.SelectedIndex = int.Parse(hd.Value);
05. ddl.SelectedIndexChanged += new EventHandler(ddl_SelectedIndexChanged);
06.}
07.
08.void ddl_SelectedIndexChanged(object sender, EventArgs e) {
09. hd.Value = ddl.SelectedIndex.ToString();
10.
11.}
