Maintain state of CheckBoxes while paging in GridView using C# and VB.Net in ASP.Net

Hi,

http://www.aspforums.net/Threads/955345/Send-Checked-GridView-row-to-email-body-and-image-as-attachment-using-C-and-VBNet-in-ASPNet/?p=3 through this discussion we managed to mail the images of catalog from gridview checkbox selection.

But when i apply the paging on the gridview, the checkbox selection is not persistent and thus mail only the options selected on the last page of gridview. Please let me know how can we make the selection persistent and mail accordingly there after.

Regards