javascript for cascading dropdownlist

Question

using this code in mvc  

 

In view  

 

<script>

$(function () {

//Dropdownlist Selectedchange event

$("#ContId").change(function () {

$.get("/Home/GetStateById", { ID: $("ContID").Val() }, function (data) {

$("#St").empty();

$.each(data, function (index, row) {

$("#St").append("<option value='" + row.ID + "'>" +

row.Statename + "</option>");

// here we are adding option for States

});

})

});

});

</script>

 

 

 

 

but this is not working plz check this code there is an exception coming  at this line .

$.get("/Home/GetStateById", { ID: $("ContID").Val() }, function (data) {