If you have aspx then it is not webservices you are building.  it is web
pages (web forms) .

To hide your code,  you can make an ASPX like this:
<%@ Page Language="C#"
Inherits="HideCodePage"
Debug="true"
Trace="false"
%>

And then define the class denoted by "Inherits=" like this:

using System;
public class HideCodePage : System.Web.UI.Page {
 private void Page_Load(object sender, System.EventArgs e) {
     Trace.Write(">> hidecode.cs: Page_Load()");
     Response.Write("\nHello, from hidecode.<br/>");
     Response.Write("\nIt is now <font size='+1' color='blue'>" +
System.DateTime.Now + "</font><br/>\n");
 }
}

Compile the above into a DLL, and install it into the webapp's bin
directory.

But this won't completely solve the problem.  Assemblies can be decompiled.
All this would do is make it a little more difficult to view the code.

-Dino