problem in redirecting the .aspx pages using VC++

Question

hi,
i am creating VC++ appication for redirecting the URL.
I saw one of the article and according ti that i have done.
http://www.codeproject.com/KB/ISAPI/isapiredirector.aspx?fid=18786&df=90&mpp=25&noise=3&sort=Position&view=Quick&select=3209730&fr=1
I have done the same thing what they have mentioned in the article but some aspx pages are not redirecting.
some .aspx pages are redirecting.
the .aspx pages which contains some linkbuttons and when we click on the link button then its displaying the error 404 file not found.
eg:  111.111.1.11/about/testimonials.aspx this is the original path.cotains some link buttons
i have redirected as /testi
it also redirecting fine.
but when i click the link button it is displaying as 111.111.1.11/testimonials.aspx
 
Server Error in '/' Application.
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The resource cannot be found.
Description: HTTP 404. The resource you are looking for (or one of its dependencies) could have been removed, had its name changed, or is temporarily unavailable. Please review the following URL and make sure that it is spelled correctly.
Requested Url: /About/testimonials.aspxmonials.aspx

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Version Information: Microsoft .NET Framework Version:2.0.40607.42; ASP.NET Version:2.0.40607.42

after getting this error i have also added another one url to redirect
/testimonials.aspx redirect it to the /about/testimonials.aspx
then also it is showing the same error.
can any one help please .....
Regards,
prakash