VS 2010 - Search XML File And Return Table

I have three XML files that are auto-generated and placed into my wwwroot directory. From there, I need to be able to search through these XML files looking for a record by either first name or last name. So, I have three xml files: a_results.xml, b_results.xml, and c_results.xml.

I'm having trouble reading / scanning these files so I really need some hand holding here. Very novice ASP/asp.net programmer here. Basically, I want a "search page" where the user will enter their search criteria into a text box (either first or last name) and the page will search the first and last name fields in all three of my xml files and return the results in a table, including the resulting first and last names plus their extension number.here is an example of one of the xml files

Code:
<response method="switchvox.extensions.search">
<result>
<extensions page_number="1" total_pages="1" items_per_page="500" total_items="3">
<extension number="1111" status="1" can_dial_from_ivr="1" account_id="1446" display="John Smith" date_created="2009-12-23 11:57:36" type="sip"

[code]....

So, as an example... I go to the page - enter "test" into the search box and click "find". The page should search all three xml files for the word "test" in the first OR last name fields and then return ALL of the combined results in a table which shows first name, last name, location and extension number (all available in the XML file(s) as shown above).