web service consumer compiler error "type or namespace...could not be found"

[websurvivor]

I have experience with Windows programming but I am new to Web programming and I am trying to create a web service. I am doing this with Notepad and the .NET SDK. I have recently built a Windows Server 2003 machine and activated IIS. I am using the default directory structure ("inetpub\wwwro ot") for the default web site. In trying to learn web service programming I have tried using multiple examples on the Web to create Web services this way. But I get a compiler error every time similar to the one below...

Server Error in '/ws1' Application.
--------------------------------------------------------------------------------

Compilation Error 
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately. 

Compiler Error Message: CS0246: The type or namespace name 'FirstService' could not be found (are you missing a using directive or an assembly reference?)

Source Error:

 

Line 1:    <%@ Page Language="C#" %>
Line 2:  <%@ Import Namespace="FirstService" %>
Line 3:    <script runat="server">
Line 4:    void runSrvice_Click(Object sender, EventArgs e)
 

Source File: c:\inetpub\wwwroot\ws1\WebApp.aspx    Line: 2

...

Version Information: Microsoft .NET Framework Version:1.1.4322.2443; ASP.NET Version:1.1.4322.2407

Here are the steps I am going through to create a web service. This particular one is an example from a codeguru.com article.

1. I have created the "FirstService.a smx" file and put it into the folder "wwwroot\ws 1" on the server.
2. I have created the "WebApp.asp x" file and put it into the folder "wwwroot\ws 1" on the server.
3. I used wsdl.exe to create "FirstService.c s", using "http://myserver/ws1/FirstService.as mx?wsdl".
4. I used csc.exe to create "FirstService.d ll" using "FirstService.c s".
5. I copied the DLL to the server. I had no "bin" folder in the "wwwroot" folder, so I created it myself. I put the DLL in there but it didn't work. I have also tried putting the DLL into the "wwwroot/ws1" folder, as well as creating a "wwwroot/ws1/bin" folder and putting the DLL there. I have also tried right-clicking on "ws1" in IIS, clicking "Properties ", then clicking the "Create" button so the folder icon turns into an icon that looks like a gear.

No matter where I put the DLL file, or where I create a "bin" folder, I keep getting the compiler error. Why is this happening?

I have tried different examples from the Web, but here is the code for one of them...

FirstService.as mx

  <%@ WebService language="C" class="FirstService" %>

  using System;
  using System.Web.Services;
  using System.Xml.Serialization;

  [WebService(Namespace="http://myserver/ws1/")]
  public class FirstService : WebService
  {
      [WebMethod]
      public int Add(int a, int b)
      {
          return a + b;
      }

      [WebMethod]
      public String SayHello()
      {
          return "Hello World";
      }
  }

WebApp.aspx

  <%@ Page Language="C#" %>
  <script runat="server">
  void runSrvice_Click(Object sender, EventArgs e)
  {
      FirstService mySvc = new FirstService();
      Label1.Text = mySvc.SayHello();
      Label2.Text = mySvc.Add(Int32.Parse(txtNum1.Text),
                    Int32.Parse(txtNum2.Text)).ToString();
  }
  </script>
  <html>
  <head>
  </head>
  <body>
  <form runat="server">
    <p>
        <em>First Number to Add </em>:
        <asp:TextBox id="txtNum1" runat="server"
             Width="43px">4</asp:TextBox>
    </p>
    <p>
        <em>Second Number To Add </em>:
        <asp:TextBox id="txtNum2" runat="server"
             Width="44px">5</asp:TextBox>
    </p>
    <p>
        <strong><u>Web Service Result -</u></strong>
    </p>
    <p>
        <em>Hello world Service</em> :
        <asp:Label id="Label1" runat="server"
             Font-Underline="True">Label</asp:Label>
    </p>
    <p>
        <em>Add Service</em> :
        & <asp:Label id="Label2" runat="server"
               Font-Underline="True">Label</asp:Label>
    </p>
    <p align="left">
        <asp:Button id="runSrvice" onclick="runSrvice_Click"
             runat="server" Text="Execute"></asp:Button>
    </p>
  </form>
  </body>
  </html>

[Frinavale]

I don't really know what to suggest as a way to fix this....
Have you seen this MSDN walkthrough for Creating an XML Web Service Using C++ and the CLR?