jQuery - call jQuery on dropdownlist change

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@model WebApplication1.Models.OrderCustomClass

@using (Html.BeginForm("Index", "Home"))
{
  @Html.DropDownListFor(x=>x.or.ProductID, new SelectList(Model.prod, "ProductID", "Name", Model.prod), "")

}

   

    @section Scripts{
    <script type="text/javascript">
        $("#or_ProductID").change(function () {
            alert("changed")
        });
    </script>
    }