Adding javascript events to dropdownlist items

This code applies to all the controls which contains ListItem, Here is a code sample for DropDownList:
XHTML Code

<asp:DropDownList ID="DropDownList1" runat="server">
 <asp:ListItem Value="1">Item 1</asp:ListItem>
 <asp:ListItem Value="2">Item 2</asp:ListItem>
</asp:DropDownList>

C# code

foreach (ListItem item in DropDownList1.Items)
{
        item.Attributes.Add("onclick", "itemclick(this);");
}

Javascript code:

function itemclick(obj)
{
            alert(obj.text);
            alert(obj.value);
}