Routing in ASP.Net web app - asp.net

Question

I am trying to use a single RouteURL to route to different pages dependent on the Route name but when I click on a button within my aspx page the page gets routed back to itself:
Here is what I have in my Global.asax
Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
' Code that runs on application startup
RegisterRoutes(RouteTable.Routes)
End Sub
Private Sub RegisterRoutes(ByVal routes As routecollection)
routes.MapPageRoute("1", "test", "~/default1.aspx")
routes.MapPageRoute("2", "test", "~/default2.aspx")
routes.MapPageRoute("3", "test", "~/default3.aspx")
End Sub
And here is what I have put in my default1.aspx page:
Protected Sub Button1_Click(sender As Object, e As System.EventArgs) Handles Button1.Click
Response.RedirectToRoute("2")
End Sub
Can anyone point me in the right direction please?

Answer 1

You have duplicated your routeUrl values in your mapped routes. What's happening is that it is routing to your second route, as found by name "2", but that route is http://yoursite/test, which, when it then processes the request, is matching to the first route entry, or default1.aspx.
You can't use the same routeUrl (i.e., "test"), for all of your mappings.
Further reading: ASP.NET Routing
An example of how you could change it:
Private Sub RegisterRoutes(ByVal routes As routecollection)
routes.MapPageRoute("2", "test/2", "~/default2.aspx")
routes.MapPageRoute("3", "test/3", "~/default3.aspx")
routes.MapPageRoute("1", "test/{*whatever}", "~/default1.aspx")
End Sub
Note in this example that route "1" is at the bottom. This is because routes are matched top-down, so more restrictive matches should be listed first. In this example yourdomain/test/2 will goto default2.aspx, yourdomain/test/3 will goto default3.aspx, and default1.aspx will essentially be the default, catching yourdomain/test, yourdomain/test/4, yourdomain/test/5, etc.