Ajax Cascadedropdownlist is not working

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ASP.NET

Ajax

Dear All,

I tried to create the Ajax Cascadedropdownlist. For that i created the Web service which contains 2 methods used to bind the data in the dropdownlist in my aspx page.

When I test the serveice, I'm getting the list of values list. But in the aspx page, the dropdownlist shows

[Method Error 12030]


Code Below :

In webservice.cs class

[WebMethod]
   [System.Web.Script.Services.ScriptMethod]
   public CascadingDropDownNameValue[]  GetMakes(
     string knownCategoryValues,
     string category)
   {
     
       List<CascadingDropDownNameValue> values =
         new List<CascadingDropDownNameValue>();
       for (int i = 1; i <= 12; i++ )
       {
           string make = (i.ToString() ) ;
           int makeId = (int) i ;
           values.Add(new CascadingDropDownNameValue(
             make, makeId.ToString()));
       }
       return values.ToArray()  ;
   }

In aspx page :

<ajaxToolkit:CascadingDropDown
ID="CascadingDropDown1"
runat="server"
TargetControlID="ddlMake"
Category="Make"
PromptText="Select a manufacturer"
ServicePath="CarsService.asmx"
ServiceMethod="GetCarMakes" />

Thanks
Sheik