Clear TextBox Text when clicked using JavaScript or jQuery in ASP.Net

No need to add this file add any jquery file .You can get it from

www.jquery.com

You can also try this

Html Code

<input id="txtText" type="text" value="<%=DateTime.Now.ToShortDateString() %>" onclick="return CheckData(this);" />

Script

<script type="text/javascript">
        function CheckData(text) {
            $(text).val('');            
        };
    </script>