<%@ page language="c#" autoeventwireup="true" debug="true" %>
<script language="c#" runat="server">
void page_load(object sender,eventargs e){
 if (!ispostback){
  hashtable htb=new hashtable();
  htb.add("1234","microsoft");
  htb.add("3210","sum");
  downlist_2.datasource=htb;
  downlist_2.datavaluefield="key";
  downlist_2.datatextfield="value";
  downlist_2.databind();
  }
 else{
  label_1.text="downlist_1 value is:"+downlist_1.selecteditem.value+"
";
  label_2.text="downlist_2 value is:"+downlist_2.selecteditem.value+"
";
 }
}
</script>
<form id="form_1" runat="server">
downlist_1:
 <asp:dropdownlist id="downlist_1" autopostback="true" runat="server">
  <asp:listitem value="default" text="default colors"/>
  <asp:listitem value="bright" text="bright colors"/>
  <asp:listitem value="dark" text="dark colors"/>
  <asp:listitem value="mono" text="black and white"/>
 </asp:dropdownlist>

downlist_2:
 <asp:dropdownlist id="downlist_2" autopostback="true" runat="server"></asp:dropdownlist>
</form>
<asp:label id="label_1" runat="server"></asp:label>
<asp:label id="label_2" runat="server"></asp:label>