Edit and reflect that edit in DataTable (parent child page)

I have 2 aspx pages say for eg A & B.

 

Page A has a list of patients with uploaded documents against an unique patient ID in a DATATABLE binded to a gridview.

 

From page A user clicks a button to view the list of files of a patient and using session we send the DATATABLE from page A to page B. Now if I edit the datatable in page B say I delete a particular file. The file at the location can be easily deleted but how can i reflect the same in the DATATABLE of page A.

 

I clear words I am asking how to reflect the changes in datatable of a child page in a datatable of a parent page.