checkbox validation in asp.net

well you can use Checked ListView

if so you have a property called SelectedItems

this is a collection of checkbox that are currently marked. you can work
on that

Suppose when you click a button in the page, and all values in the checkboxes are counted and pass to the destination page.

You can loop all the checkboxes in the button click event handler, and caculate the value.

As for how to pass value from one page to the other page. This article lists all the possible ways