Implemented Routing for WebForms asp.net 4.0 error 404 for files css js and jpg

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VB

ASP.NET

WebForms

SEO

routing

Hi,

I have implemented routing on my website and almost everything works fine but I get an error message for any include because the path is wrong cause of the routing.
I try to be more clear and show my code.
Starting from my link in my home page

<a href="search/shose/" title="" > <img  class="borderBlack"  src="immagini/b5.jpg" alt="" /></a>

than in the global.asax just added for the purpose

Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
     Me.RegisterRoutes(RouteTable.Routes)
End Sub

Sub RegisterRoutes(ByVal routeCollection As RouteCollection)
      routeCollection.Ignore("{resource}.css/{*pathInfo}")
      routeCollection.Ignore("{resource}.axd/{*pathInfo}")
      routeCollection.MapPageRoute("RouteForpage", "search/{typology}/", "~/search-by-typology.aspx")
End Sub

as you can see there I added ignore .css file but I don't know why when I click on the link above open the right page but through dev tool I see lots of error messages 404 for any link o my page. this is one of them inside the page

search-by-typology.aspx

<link rel="stylesheet" href="modifiedStyle.css"  type="text/css" media="screen" />

why the ignore is not working fine, am I missing something?

Thank you in advance for your help