Answer / om shivaya namaha

By using Onblur property we can do that one
onblur event will fire when ever u ar moving from one
control to another control then this event will fire

in Serverside code:-
textbox1.attributes.add("onblur","fuPopuppage();")

in AspPage :-

<script type ="text/javascript" language ="javascript" >
function fuPopuppage()
{

window.open('parentpage.aspx','parent','height=500;width=500');
}


</script>


in the parent page :-
severside code:-
label.text= window.opener.document.forms[0].textbox1.vale

onthe parent page the label message will be shown what ever
u enter in the chiled page

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