Grid view data loading problem

Question

Hi

 

 

I take a aspx page as pop-up  and displaying some records on that page in grid view,

 

in a grid view i have a button, on the button  click i get the data of that row.

 

but problem is that

 

Suppose i have 715 records in that grid view

 

 when i show 710 and get one records from them it works fine.

 

but when i show "711" records , then data in unload when i clicked on button.