I add in my project WCF service (ProductService.svc in forder Services):

```
using System; 
using System.Linq;  
using System.Runtime.Serialization; 
using System.ServiceModel; 
using System.ServiceModel.Activation; 
using System.ServiceModel.Web; 
using System.Web.Services; 
using System.Collections.Generic; 

namespace Application.Services {
    [ServiceContract(Namespace = "")]
    [AspNetCompatibilityRequirements(RequirementsMode
= AspNetCompatibilityRequirementsMode.Allowed)]
    public class ProductService
    {
        [WebMethod]
        [OperationContract]
        public static string GetMainGridProductHtml()
        {
            return "Helo World :)";
        }
    } 
 }

```

And try to call service from javascript file: 

```
<script type="text/javascript">
Application.Services.ProductService.GetMainGridProductHtml(ResultLoadTableMainGridHtml, ErrorLoadTableMainGridHtml);

function ResultLoadTableMainGridHtml(html) {
    debugger;
    alert("Ok");
}

function ErrorLoadTableMainGridHtml() {
    debugger;
    alert("Error");
}

function NewAddBtn() {
    debugger;
    alert("Yuppi");
}
</script>

```

It won't work: Microsoft JScript runtime error: 'Application' is undefined
How can I manage this?