Another way is to simply add a CSS class to all your text boxes, then you can attach by class name, e.g
Your MVC markup...(just make sure you add the class attribute)
<![CDATA[<%= Html.TextBoxFor("LastName", Model.LastName, new { @class = "date-picker" })%>]]>
Jquery init...
$('.date-picker').datepicker({ dateformat: 'dd-mm-yyyy', showOn: "button",
buttonImage: '/Images/calendar1.gif',
buttonText: "Choose a date",
buttonImageOnly: true, hideIfNoPrevNext: true
});