I am trying to encapsulate logic within classes, so I have this:

Public Class StolenVehicleTemplate
   Private _Make As String
   Public Property Make() As String
       Get
           Make = _Make
       End Get
       Set(ByVal value As String)
           If value = "" Then
               ThrowException("E701", "Make cannot be blank")
           End If
           _Make = value
       End Set
   End Property
   Private Sub ThrowException(ByVal strCode As String, ByVal strMessage As
String)
       Dim node As System.Xml.XmlNode =
doc.CreateNode(System.Xml.XmlNodeType.Element, _
           SoapException.DetailElementName.Name, _
           SoapException.DetailElementName.Namespace)
' Node gets built here
       Dim objException As New SoapException("One or more mandatory
elements was not specified", _
                                   SoapException.ClientFaultCode, _
                                   "", _
                                   node)

       Throw objException
   End Sub
End Class

Whatever I try, I cannot persuade the detail element (node) to appear in the
exception.  When I use exactly the same code, but directly within a
webmethod rather than in a class that is referenced from the webmethod, it
all works fine.

Am I missing something?  I really want to be able to give the consumer a bit
more detail, without having to define it again and again, every time I use
the class.