Problem with classes in a web service

I'm trying to create a web service that exposes a class.
Below is a
simplified example.
The web service has the following code (detail removed):

<WebService(...)><WebServiceBinding(...)> Public
Class MyClass
            Inherits System.Web.Services.WebService

            <WebMethod()> Public Sub MySub()
                        Dim z As MyExposedClass
            End Sub

End Class

Public Class MyExposedClass
            Public sValue As String
End Class

Obviously this isn't doing anything useful, but it shouldn't
be
doing anything illegal either. When I try to use this in
another app, I
get the following results:

Dim cTest As New compasstwo.MyClass   ' Initialize the class
cTest.Credentials =
System.Net.CredentialCache.DefaultCredentials   '
Pass credentials

Dim z As cTest.MyExposedClass   ' This statement works fine

cTest.MySub()   ' This call fails: "The request failed
with HTTP
status 401: Unauthorized."

Why is it that I can create a variable of type
MyExposedClass in the
calling app, but I can't do the same thing in the web
service? I'm
sure I'm missing something. Any thoughts?


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