How to Store CheckBox Checked and Unchecked in Hidden Field

Question

Hi, 

Actually i am checking and Unchecking Checkbox using Jquery

 

Now,When I click on Preview Buttton ... Its the Checked Checkbox Record.

 

But When I click on Send Button,Which is inside Popup

 

 

But i am losing Checkbox Checked Records and all records inside child Gridview Visible.

 

 

At Page_load all Checkbox Should be Checked.Its my Condition.