How to bind and call selected event of dropdownlist in MVC 3

//Bind dropdown on layout page

@if (Session["List of data"] != null)
                {
                    @Html.DropDownList("Dropdown ID", Session["List of data"] as SelectList)
                }

then create controler and write your business logic.



//Dropdown change event on Layout(master)
//calling controler

<script type='text/javascript'>
    $(document).ready(function () {


        $('#Dropdown ID').change(function () {
            var v1 = $(this).val();
            if (v1 != $('#hidden control ID').val()) {
                var url = '/controler name/action name/' + v1;
                window.location.replace(url);
             
            }

        });
    });

 
</script>



Set dropdown value as selected true  on Layout(master).....



@if (Session["Dropdown selected value"] != null)
{
    @Html.Hidden("hdnDrp", Session["Dropdown selected value"].ToString());
    <div>
    <script type="text/javascript">
        $(document).ready(function () {
            var v = $('#hidden control ID').val();
            if (v != null)
                $('#Dropdown ID').val(v);

        });
    </script>
    </div>
}




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