data grid problem

Question

I have this datagrid in my program that pulls its rows based on a data relation from another datagrid on the same page.  The database that I am pulling the information from comes from another program so I cannot really add tables and such.  Anyways one of the items that comes into my list comes in as a number that represents something.  I don't want the number to be shown.  I want what it represents to be shown.  Now I thought to make an xml file with the representations, and then add a realtion to my xml file but I can't seem to figure out how to implement it.  Is this a good way to do this?  How else might I accomplish such a task??