checkbox checked inside grid view then open popup .net c#

hii,

 i have nested grid view and when i check header check box then checked all check box and then uncheck all check box uncheck this is work properly but i want when 

 

i checked header check box then checked all check box and open a popup with one text box,

 

and when  i don't checked header check box but i will  checked manually check box 

 

i.e. if i check two check box then open popup but add two text box

 

i.e

 

when i checked header check box then open popup only one text box

 

but when not checked header but check multiple check box then add multiple text box

 

sorry for my poor English