Application_BeginRequest method of Global.asax file can be used to rewrite the URL of the current page.? Following code snippet shows you how to achieve this goal.

<%@ Application Language=?VB? %>
<script runat=?server?>

Protected Sub Application_BeginRequest(ByVal sender As Object, ByVal e As EventArgs)

?This is for dynamic redirection without having to create a directory in the root folder. We
?needed to change the 404 in IIS under custom errors to /(forward slash) instead of the default 404b.html

If Regex.IsMatch(Request.Url.AbsoluteUri, ?404;?) ?Get the url from browser address bar
Dim UrlSplit(), url as String
UrlSplit = Request.Url.AbsoluteUri.Split(??404;?) ?Split the url where the error occured in this case 404
url = replace(UrlSplit(1), ?404;?, ??)
url = replace(url, ?http://www.youraddress.com?, ??) ?Replaces the youraddress.com address and puts nothing

?Select Case to check where the page should be redirect too.
Select Case url
Case ?/aboutmypage?
response.Redirect(?/aboutus?) ? Redirects to correct url.
Case ?/yourprogram?
response.Redirect(?/programs/yourprogram?)
Case ?/canucks?
response.Redirect(?/sports/hockey/canucks?)
Case Else
response.redirect(?/help/sitemap/index.aspx?)
End Select
End If
End Sub

</script>