I am building my first asp.net mvc application for learning and development purposes and have come across an issue that I'd like some guidance with.

Suppose I have a controller with two actions as follows:

public class MyController : Controller
{
    public ActionResult Index()
    {
     dbData = GetData("DefaultParameter")
     return View(dbData);
    }

    public ActionResult UpdateView(string dbParameter)
    {
     dbData = GetData("dbParameter");
     return View(dbData);
    }
}

On my webpage I have the following:

    <% using (Html.BeginForm("UpdateView", "MyController")) %>
    <% { %>
    <div class="dropdown"><%=Html.DropDownList("Selection", Model.List, new { onchange="this.form.submit();" })%></div>         
    <% } %>

I have the following route in Global.asax:

public static void RegisterRoutes(RouteCollection routes)
{
routes.MapRoute("Default", "{controller}", new { controller = "MyController", action = "Index"});
}

The issue I am having is as follows:

When I use the dropdownlist I get an error saying that /MyController/UpdateView could not be found. It therefore seems that I need to add an additional route as follows:

    routes.MapRoute("Default", "{controller}", new { controller = "MyController", action = "UpdateView"});

However, this causes two new issues for me:

1. Due to the hierachy within the routing list, the similarity of the routes means that the one that appears first in the list is always executed.
2. I don't see why I need to create another route for UpdateView. All I want to do is to retrieve new data from the database and update the view. I don't see what this has to do with the URL schema.

It feels like I have gone down the wrong track here and I have missed something quite fundamental?