How to add datepicker in asp.net MVC

<div class="editor-field">
           @Html.LabelFor(model => model.DOB)
 </div>

 <div class="editor-field">
            @Html.TextBoxFor(model => model.DOB, new {id = "date-picker",@onchange="getage(this.value);" })
            @Html.ValidationMessageFor(model => model.DOB)
  </div>

 <p id="val"></p>




<script type="text/javascript">
    debugger
    $(document).ready(function () {
        debugger
        // This will make every element with the class "date-picker" into a DatePicker element
        $('#date-picker').datepicker();
     
       
    });
    function getage(dob) {
        debugger

        var myyear = dob.substring(6, 10);
        var mymonth = dob.substring(0, 2);
        var myday = dob.substring(3, 5);
       
        today_date = new Date();
        today_year = today_date.getFullYear();
        today_month = today_date.getMonth();
        today_day = today_date.getDate();
        age = today_year - myyear;

        if (today_month < (mymonth - 1)) {
            age--;
        }
        if (((mymonth - 1) == today_month) && (today_day < myday)) {
            age--;
        }
       

        document.getElementById("val").innerHTML = age;

       
    }
</script>

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