ASP.NET

<asp:ComboBox ID="Combo1" runat="server" Width="80px" AutoPostBack="True"
   ListItemHoverCssClass="ComboListItemHover">
   <asp:ListItem Text="Item1" Selected="True" />
   <asp:ListItem Text="Item2" />
   <asp:ListItem Text="Item3" />
   <asp:ListItem Text="Item4" />
</asp:ComboBox>

<br />
.ComboListItemHover<br />
{<br />
   background-color: #F2D429;<br />
}<br />

[ActionName("AddEmail")]
[AcceptVerbs(HttpVerbs.Post)]
public EmptyResult AddEmail(FormCollection collection)
{
    Console.WriteLine("I called the AddEmail ActionMethod!");

    return new EmptyResult();
}

public class MvcApplication : System.Web.HttpApplication
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        //routes.MapRoute(

        routes.MapRoute(
            "Default",
            "{controller}",
            new { controller = "Test", action = "AddEmail", id = "" }
        );
    }

    protected void Application_Start()
    {
        RegisterRoutes(RouteTable.Routes);
    }
}