I use following java script solve this:
<script language="javascript" type="text/javascript">
function DisableTextboxPostback() {
$(':text').bind('keydown', function (e) {
if (e.keyCode == 13) {
e.preventDefault();
return false;
}
else
return true;
});
}
function onBodyLoad() {
DisableTextboxPostback();
}
</script>
Make javascript function to prevent postback and call that function on bodyload that way page will not to postback.