[jquery] How to populate a dropdownlist with json data in jquery?

I am developing a country state cascading dropdown list... I returned json result based on countryId but I don't know how to populate/fill it in a new dropdown listbox...

Here is what I am using,

function getstate(countryId) {
    $.ajax({
        type: "POST",
        url: "Reg_Form.aspx/Getstates",
        data: "{'countryId':" + (countryId) + "}",
        contentType: "application/json; charset=utf-8",
        global: false,
        async: false,
        dataType: "json",
        success: function(jsonObj) {
            alert(jsonObj.d);
        }
    });
    return false;
}

And alert gave this,

{"Table" : [{"stateid" : "2","statename" : "Tamilnadu"},
            {"stateid" : "3","statename" : "Karnataka"},
            {"stateid" : "4","statename" : "Andaman and Nicobar"},
             {"stateid" : "5","statename" : "Andhra Pradesh"},
             {"stateid" : "6","statename" : "Arunachal Pradesh"}]}

And my aspx page has this,

<td>
<asp:DropDownList ID="DLCountry" runat="server" CssClass="dropDownListSkin" 
 onchange="return getstate(this.value);">
 </asp:DropDownList>
  </td>
 <td>
 <asp:DropDownList ID="DLState" runat="server" CssClass="dropDownListSkin">
   </asp:DropDownList>
 </td>

Any suggestion on how to fill DLState dropdown...

EDIT:

When I inspected through firebug I got the response for my ajax post,

{"d":"{\"Table\" : [{\"stateid\" : \"2\",\"statename\" : \"Tamilnadu\"},{\"stateid\" : \"3\",\"statename\" : \"Karnataka\"},{\"stateid\" : \"4\",\"statename\" : \"Andaman and Nicobar\"},{\"stateid\" : \"5\",\"statename\" : \"Andhra Pradesh\"},{\"stateid\" : \"6\",\"statename\" : \"Arunachal Pradesh\"},{\"stateid\" : \"7\",\"statename\" : \"Assam\"},{\"stateid\" : \"8\",\"statename\" : \"Bihar\"},{\"stateid\" : \"9\",\"statename\" : \"Dadra and N. Haveli\"},{\"stateid\" : \"10\",\"statename\" : \"Daman and Diu\"},{\"stateid\" : \"11\",\"statename\" : \"Delhi\"},{\"stateid\" : \"12\",\"statename\" : \"Goa\"},{\"stateid\" : \"13\",\"statename\" : \"Gujarat\"},{\"stateid\" : \"14\",\"statename\" : \"Haryana\"},{\"stateid\" : \"15\",\"statename\" : \"Himachal Pradesh\"},{\"stateid\" : \"16\",\"statename\" : \"Jammu and Kashmir\"},{\"stateid\" : \"17\",\"statename\" : \"Kerala\"},{\"stateid\" : \"18\",\"statename\" : \"Laccadive Islands\"},{\"stateid\" : \"19\",\"statename\" : \"Madhya Pradesh\"},{\"stateid\" : \"20\",\"statename\" : \"Maharashtra\"},{\"stateid\" : \"21\",\"statename\" : \"Manipur\"},{\"stateid\" : \"22\",\"statename\" : \"Meghalaya\"},{\"stateid\" : \"23\",\"statename\" : \"Mizoram\"},{\"stateid\" : \"24\",\"statename\" : \"Nagaland\"},{\"stateid\" : \"25\",\"statename\" : \"Orissa\"},{\"stateid\" : \"26\",\"statename\" : \"Pondicherry\"},{\"stateid\" : \"27\",\"statename\" : \"Punjab\"},{\"stateid\" : \"28\",\"statename\" : \"Rajasthan\"},{\"stateid\" : \"29\",\"statename\" : \"Sikkim\"},{\"stateid\" : \"30\",\"statename\" : \"Tripura\"},{\"stateid\" : \"31\",\"statename\" : \"Uttar Pradesh\"},{\"stateid\" : \"32\",\"statename\" : \"West Bengal\"}]}"}

//javascript
//teams.Table does not exist

function OnSuccessJSON(data, status) {
    var teams = eval('(' + data.d + ')');
    var listItems = "";
    for (var i = 0; i < teams.length; i++) {
      listItems += "<option value='" + teams[i][0]+ "'>" + teams[i][1] + "</option>";
    }
    $("#<%=ddlTeams.ClientID%>").html(listItems);
} 

try this one its worked for me

$(document).ready(function(e){_x000D_
        $.ajax({_x000D_
           url:"fetch",_x000D_
           processData: false,_x000D_
           dataType:"json",_x000D_
           type: 'POST',_x000D_
           cache: false,_x000D_
           success: function (data, textStatus, jqXHR) {_x000D_
                        _x000D_
                         $.each(data.Table,function(i,tweet){_x000D_
      $("#list").append('<option value="'+tweet.actor_id+'">'+tweet.first_name+'</option>');_x000D_
   });}_x000D_
        });_x000D_
    });

To populate ComboBox with JSON, you can consider using the: jqwidgets combobox, too.