How to find my methods is being used in which UI's code in my application

Hi All,
My application is based on 3 tier architecture. I need to make some changes in my method which is in data access layer.
How can I find that where I have used this method i.e. I need to find out the aspx.cs (UI code files) files where I have used this method.
How can achieve this?
Thanks
Gaurav