what is the best way to get a query string?

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MVC

Hello. I'm new in MVC (and in rest of proggramming :) ) I build a kind of manager dashboard using MVC.there are few divs that contains tables. i have an XML file that contains the querystrings for those tables. on first load everything works fine. now i have to do a zoom button on each table that reloads the table's data to some ZOOMDiv , so i need tables query again. i have 3 ways to get it but i need the most efficiant. 1. read xml file again. 2. when i do load on my first run to keep those querystrings in some variables 3. when i do the first run to put the queries in DB... myeby there is some othere better way , i dont know... what do you think?
Thanks a lot.