<asp:ListItem Value="0">111</asp:ListItem>
<asp:ListItem Value="1">222</asp:ListItem>
<asp:ListItem Value="2">333</asp:ListItem>
</asp:DropDownList>
<script type="text/javascript" language="javascript">
function SearchChange()
{
var ddl = document.getElementById("DropDownList1")
var index = ddl.selectedIndex;
var Value = ddl.options[index].value;
var Text = ddl.options[index].text;
alert(Value);
}
</script>