Code that should be written .. 

 <script type="text/javascript" src="JScript.js"></script>

<script type="text/javascript">
$(document).ready(function() {
$('#<%= Label1.ClientID %>').fadeOut(1500, function() {
$(this).html(""); //reset the label after fadeout
});
});
</script>




Drag and drop a label on to the form

  <asp:Label ID="Label1" runat="server" />


Sample JavaScript that should be included was attached. Try it and let me know if any issues.