Hi nauna,
Please refer below sample.
HTML
<link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/themes/base/jquery-ui.css"
type="text/css" media="all" />
<link rel="stylesheet" href="http://static.jquery.com/ui/css/demo-docs-theme/ui.theme.css"
type="text/css" media="all" />
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/jquery-ui.min.js"
type="text/javascript"></script>
<script type="text/javascript">
$(function () {
$("#<%=txtDate.ClientID %>").datepicker({
autoclose: true,
changeMonth: true,
changeYear: true,
minDate: new Date()
});
});
</script>
<asp:TextBox ID="txtDate" runat="server"></asp:TextBox>
Screenshot