Filtering XML via ASP or XSL?

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ASP

XML

XSLT

Hi,

I know my basics and I have difficulties implementing it altogether.

I have a projects.xml file containing the list of all my customers projects.
My web page should by default show all projects, or filter projects by project Name or Customer.

I want to know what is best practice when applying my filters:
- apply a different xsl to each filter
- use asp to access xml and filter the info before it is sent to xsl

if I need to select all the projects for Customer A, would I use xls (for-each) or ASP using DOM functions?

Example of the xml:

<projects>
   <project>
       <projname>Project A1</projname>
       <customer>A</customer>
   </project>
   <project>
       <projname>Project A2</projname>
       <customer>A</customer>
   </project>
   <project>
       <projname>Project B</projname>
       <customer>B</customer>
   </project>
</projects>