URL Rewriting in >NET

<urlMappings configSource="Mapping.xml" />
Mapping.xml
<?xml version="1.0" encoding="utf-8" ?>
<urlMappings>
<add url="~/Page1.aspx" mappedUrl="~/Default.aspx?ID=1" />
<add url="~/Page2.aspx" mappedUrl="~/Default.aspx?ID=2" />
</urlMappings>