Translates an ASP.NET path like /myapp/subdir/page.aspx into an application relative path: subdir/page.aspx. The path returned is based of the application base and starts either with a subdirectory or page name (ie. no ~)
The path is turned into all lower case.
Application relative path (ie. subdir/page.aspx)
A logical, server root relative path (ie. /myapp/subdir/page.aspx)