iframe içerisinde :
<input type="button" class="btn btn-primary" value="KAPAT" onclick="modalkapat();"/>
<script>
function modalkapat() {
//window.parent.$("#ContentPlaceHolder1_lbtn_yenile").click();
//window.parent.$("#ContentPlaceHolder1_txt_Note").val('asdas');
window.parent.__doPostBack('ctl00$ContentPlaceHolder1$lbtn_yenile', '');
parent.jQuery.colorbox.close();
return false;
}
</script>
veya
<link rel="stylesheet" href="css/colorbox.css" />
<script type="text/javascript" src="js/jquery.colorbox.js"></script>
<script type="text/javascript">
$(document).ready(function () {
$(".iframe").colorbox({ iframe: true, width: "80%", height: "80%", onClosed: function () { __doPostBack('ctl00$ContentPlaceHolder1$lbtn_yenile', ''); }});
});
</script>