Make sure you add the following js and css files.
* jquery-1.4.1.min.js
* jquery.ui.core.js
* jquery.ui.datepicker.js
* jquery-ui-1.8.8.custom.css
Now paste the following code:
<script type="text/javascript">
$(function () {
var date = new Date();
var currentMonth = date.getMonth(); // current month
var currentDate = date.getDate(); // current date
var currentYear = date.getFullYear(); //this year
$("#<%= tbxRequestDeliveryDate.ClientID %>").datepicker({
changeMonth: true, // this will allow users to chnage the month
changeYear: true, // this will allow users to chnage the year
minDate: new Date(currentYear, currentMonth, currentDate)
});
});
</script>
<asp:textbox id="tbxRequestDeliveryDate" runat="server" cssclass="text" xmlns:asp="#unknown">
For more detail click
here