Debug ASP.NET Web Service in VB.NET

Hello!
   I'm using Visual Studio.NET 2003, and i need to debug an ASP.NET Web Service consumed from a VB.NET application.
   To simplify things, i've wrote a VB.NET application that adds two numbers (see the attached code). To do that my application consumes a web service. I've created an ASP.NET Web Service project under the same solution as my application  (see the attached code). If i need to debug that service, haw can i do that? If i put breakpoints in service code it has no effect (they are skipped).
   Can you help me?   Thank you!
 

'APPLICATION
Imports System.Web.Services
Public Class Form1
    Inherits System.Windows.Forms.Form
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        'web reference pt. IIS    - http://localhost/AddThis/Service1.asmx
        Dim a As New localhost.Service1
        Dim x As Int16
        Dim y As Int16
        '
        x = CInt(TextBox1.Text)
        y = CInt(TextBox2.Text)
        '
        MsgBox(a.AddThese(x, y))
        MsgBox("OK!")
    End Sub
End Class
 
'WEB SERVICE
Imports System.Web.Services
<System.Web.Services.WebService(Namespace := "http://tempuri.org/AddThis/Service1")> _
Public Class Service1
    Inherits System.Web.Services.WebService
 
    Public c As Int16
    <WebMethod()> _
    Public Function AddThese(ByVal a As Int16, ByVal b As Int16) As Int16
        c = a + b
        Return c
    End Function
End Class

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