UrlRewriting is used for display an artificial URL not actual URL. Some days before i found a freeware library for UrlRewrite which is very useful.

 Intelligencia.UrlRewriter.dll.

Edit Web.Config
 

<section name="rewriter" requirePermission="false" type="Intelligencia.UrlRewriter.

Configuration.RewriterConfigurationSectionHandler, Intelligencia.UrlRewriter"/>

<httpModules>

<add name="UrlRewriter" type="Intelligencia.UrlRewriter.RewriterHttpModule, Intelligencia.UrlRewriter"/>

</httpModules>

<rewriter>

            <rewrite url="~/Article/(.+).aspx" to="~/Article.aspx?category=$1"/>

</rewriter>

1. (~/Article.aspx?category=$1)

Your actual page in root directory and category is parameter.

2. (~/Article/(.+).aspx)

Artifical URL looks like http://www.yourwebsite.com/Artical/page.aspx

Article.aspx.vb

 Request.QueryString("Category")

You  can download free library from

http://urlrewriter.net/index.php/support/configuration/