Rewrite Url not working in asp.net

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ASP.NET

Hello Everyone,

Hi I have Web Config in that i am using Following Code

<rewriter>

<rewrite url="~/A/B/Index" to="~/A/B/Index.aspx"/>

<rewrite url="~/A/B/IndexDetail" to="~/A/B/IndexDetail.aspx?SrNo="/>

</rewriter>

In Index.aspx I am creating dynamically anchor tag
on that anchor tag i am calling Indexdetail.aspx?sr=SrNo page
but in url it can not be rewrite.

my question is
then what should i do to hide querystring useing rewrite

note : avoid my bad english
thanks
Chetan V