gridview paging problem

Question

hi iam using asp.net2.0 with c#
In the gridview 1st column is checkbox,in my gridview iam using paging , iam dispalying data at page load,
when user selects the check box that records are stored in database.
but when i selects the checkbox at 1st page then it is
storing all the records but when i selects the 1st page records as well as 2nd page records
 then it is storing only second page records .

iwant to store all the records what ever  user has  selects the checkbox.
can you give me example which helps me.