I've been fighting a WebService for the past few days.  I wrote a simple service, and managed to get it running locally.  I tried to get it to work on the test server, but only got a response: "Internal Service Error".  In researching that message, I read that web services cannot be used in DNN, and I needed to use IWebCF.  After a fruitless day working on that, I was doing more googling about "Internal Service Error".  I finally came across a message that solved my problem with the initial service.  I did not need IWebCF at all.

There are lots of questions posted about calling a web service from jQuery, as well as the error message.  Not many answers, though.  In case it will help someone in the future, here is my solution:

I added a new DotnetNuke Dynamic Module item in DesktopModules.  I removed the Edit_ and View_ files and created my own SayHello.ascx.

<%@ Control Language="C#" Inherits="MWIWeb.Modules.SayHello.SayHello" CodeFile="SayHello.ascx.cs" AutoEventWireup="true" %>

<script language="javascript" type="text/javascript">

 $(document).delegate('.SayHello', 'click', function (e) {
  e.preventDefault();

  $.ajax(
      {
       type: "POST",
       url: "MyService.asmx/HelloWorld",
       data: "",
       dataType: "html",
       success: function (msg) {
      msg);
   },
       error: function (XMLHttpRequest, textStatus, errorThrown) {
          errorThrown);
       }
      });
 });
 
</script>

<asp:Button ID="cmdSayHello" Text="Say Hello" runat="server" class="SayHello" />
 
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In the DNN root folder, I added a WebService item call MyService.
 
 public class MyService : System.Web.Services.WebService {

    public MyService () {
    }

    [WebMethod]
  public string HelloWorld() {
   HttpContext.Current.Response.Write("Hello World");
  }
}
 
***********************************************************************************************************

To make it work on our test server, I added this text to the web.config before the </system.web>:

    <webServices>
        <protocols>
            <add name="HttpSoap, HttpPost, Documentation, HttpPostLocalhost" />
        </protocols>
    </webServices>

Finally, go into Host | Extensions and create a new Custom Module from Sayhello.ascx.

(I didn't really use "MyService" and "SayHello". I changed the names to protect the innocent.)

Cheers!
Dan

On a clear disk, you can seek forever.