Asp.net 2.0 Ajax extender not working

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ASP.NET

i am developing an application where i need textbox where my users will get an autocomplete feature.


(((((1)))))))
I did this code in web service

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class GetPlace : System.Web.Services.WebService {

    public GetPlace () {

        //Uncomment the following line if using designed components
        //InitializeComponent();
    }

    [System.Web.Services.WebMethod]
    [System.Web.Script.Services.ScriptMethod]
    public string[] GetPlace1(string prefixTex)
    {
        string[] s={"Hello World","abc"};
        return s;
    }

I expected this will pop up "Hello World","abc" but it does not show any thing. please help me



(((((2)))))))
and this for Control

           <asp:TextBox ID="txtCountry" runat="server" Height="25px" Width="395px">
                            <cc1:AutoCompleteExtender ID="AutoCompleteExtender1"  
                             MinimumPrefixLength="1"  runat="server" TargetControlID="txtCountry"
                               
                              ServiceMethod="GetPlace1" ServicePath="GetPlace.asmx"
                            >
                            





I expected this will pop up "Hello World","abc" but it does not show any thing. please help me