Loop through datatable of previous page

Hi, May i know how to loop through the records of grid view that is in different page and populate it to another grid view that is on another page using c#?

This is my code, but I am not sure of how to continue.Thanks!

DataTable dtgvCriticalTerms = null; //Reflect the CT table in SQL Server

//get viewstate datatable to variable
DataTable dtSelectedContracts = (DataTable)ViewState[selectedContracts];

for loop all rows in dtSelectedContracts

* {

* String tempcontractid = dtSelectedContracts[0] first column (contract id)

* got to database and retrieve critical terms for tempcontractid

* add database results to dtgvCriticalTerms

* }

Thanks