How to pass values between asp.net pages with gridviews

I enabled the selection on my gridview. The question is, I can pass values with buttons but it seems redundant, because I have selection linkbuttons. So how can I pass variables with them ?

This example shows how to work with LinkButton in GridView and pass / transfer variable or data to other page and populate another gridview based on it using QueryString and QueryStringParameters. What's more, there is no need of any code behind. Pretty cool.