My problem is that I tried changing the localhost to ip address/computer name and still cannot access. My web service  link goes like this http://localhost:1228/TryService.asmx?op=HelloWorld.
How can I make it accessible thru the local area network?
Thanks for the reply
Current Code:
I haven't touched in webconfig
/// <summary>
/// Summary description for EDCService
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
// [System.Web.Script.Services.ScriptService]
public class EDCService : System.Web.Services.WebService
{
    [WebMethod]
    [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
    public string HelloWorld()
    {
        return "Hello World";
    }
}
app MOVE TO IIS UPDATE:
ERROR
 HTTP Error 500.21 - Internal Server Error
Handler "PageHandlerFactory-Integrated" has a bad module "ManagedPipelineHandler" in its module list
