Please Help me to select event for getting cities in INDIA after calling web service for states in INDIA.

Hi All,

I am populating Autocomplete data in textbox with states name in India by using below web service code:

 [System.Web.Services.WebMethod]
    public static string[] GetNames(string prefixText, int count)
    {
        NamesDataContext db = new NamesDataContext();

        return db.StateAndCityMasters.Where(n => n.state.StartsWith(prefixText)).OrderBy(n => n.state).Select(n => n.state).Take(count).ToArray();
    }

Also in design file as below :

<td><ajaxToolkit:AutoCompleteExtender ID="txtName_AutoCompleteExtender" runat="server"
                TargetControlID="statecombo" MinimumPrefixLength="1" ServiceMethod="GetNames"></ajaxToolkit:AutoCompleteExtender></br><asp:TextBox ID="statecombo" runat="server" AutoComplete="Off"  CssClass="txtfld3" Font-Size="Large"  ></asp:TextBox></td>

I want to populate cities in indian states after typing State name in the state textbox .

Now  my problem is in which event i should write code to get cities in States in India to populate cities drop down list .

Please help me to select specific event where i can populate cities in city drop down list.

Regards,

Jayesh.(From India,Mumbai)