What is the alternative for autocomplete text changed event in MVC3

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ASP.NET

MVC3

How can i add mvc3 Autocomplete textbox changed event same as cascading dropdownlist. Below is my code in this code i want after entering statesText data automatically cities text will be changed.

my view code.

<div style="float: left">
States Filter :
</div>
<div style="float: left; padding-removed 10px">
@Html.TextBox("Statestxt")
@Html.TextBox("Citiestxt")
</div>
<div style="padding-removed 10px; float: left">
<input type="image" value="submit" src="../../Images/FilterBrowse.gif" 
alt="submit Button" /> 
</div>
 <script type="text/javascript">
        $(document).ready(function () {
            $("#Statestxt").autocomplete({
                source: '@Url.Action("AutocompleteAsync")'});
                $("#Citiestxt").autocomplete({
                source: '@Url.Action("AutocompleteCity")'
            });
        });
    </script>

**My controller:**

[NoCache]
public ActionResult AutocompleteAsync(string term)
{ 
var suggestions = from s in Adm.states
select s.state_name;
var namelist = suggestions.Where(n => n.ToLower().StartsWith(term.ToLower()));
return Json(namelist, JsonRequestBehavior.AllowGet);
}

[NoCache]
        public ActionResult AutocompleteCity(string term)
        {
            var suggestions = from s in Adm.cities
                              select s.city_name;
            var namelist = suggestions.Where(n => n.ToLower().StartsWith(term.ToLower()));
            return Json(namelist, JsonRequestBehavior.AllowGet);
        }

If text is changed in States Textbox city autocomplete should be refilled.
Thanks.