how to use multiple parent with one child page in asp.net

hi folks,


   in my website there are mulitple page work as parent and only one page for child.means parent page send data to child page and child page show data to  page.when user do any action on chidpage get that page data and revert back to the parent page.
but here problem is that how i identify when parent page was previously get request..
any link please share.


thank you in advance