how to stop adding new row to gridview when last row is empty on button click using JQuery

Hi shaks,

Please refer below query

JavaScript

<script type="text/javascript">
    $(function () {
        $('[id*=ButtonAdd]').on('click', function () {
            var row = $('[id*=Gridview1]').closest('tr').last().prev();
            if (row.find('[id*=TextBox]').val() == '') {
                alert('Please Fill the Details');
                return false;
            }            
        });
    });
</script>

Hope this works for you