I'm having a problem which is driving me mad.

I have a simple remote object which I am hosting in a windows forms
app.  The code for the class is (modified from Coding4Fun Issue 6):

===================================================
Imports Microsoft.MediaPlayer.Interop
Imports PlayerHost.MediaPlayer
Imports System.Drawing.Imaging
Imports System.Data

Public Class Information
   Inherits MarshalByRefObject

   Public Function GetEverything() As DataTable

       Dim pl As IWMPPlaylist
       pl = Player.mediaCollection.getAll()
       Dim Library As New DataTable("Library")

       Library.Columns.Add("Artist")

       If pl.count > 0 Then

           For y As Integer = 0 To pl.count - 1
               Dim newrow As DataRow = Library.NewRow()
               Dim track As IWMPMedia = pl.Item(y)
               newrow("Artist") = track.getItemInfo("Artist")
               Library.Rows.Add(newrow)
           Next

       End If

       Return Library

   End Function

<..... other methods an stuff removed for brevity .....>

End Class
===================================================

My windows forms app exposes this class in its OnLoad event like so:

===================================================
RegisterWellKnownServiceType(GetType(Information), "Information.soap",
WellKnownObjectMode.SingleCall)
Dim channel As New Channels.Http.HttpChannel(9000)
Channels.ChannelServices.RegisterChannel(channel, False)
===================================================

If I then run the app and connect to the url
http://localhost:9000/Information.soap?WSDL I get the schema as
expected.  I then add a web reference to the schema in VS2005.  This
seems to work fine and I get no errors.

The namespace definitions look like this:

===================================================
<definitions name="Information"
targetNamespace="http://schemas.microsoft.com/clr/nsassem/PlayerHost/PlayerHost%2C%20Version%3D1.
0.0.0%2C%20Culture%3Dneutral%2C%20PublicKeyToken%3Dnull"
xmlns="http://schemas.xmlsoap.org/wsdl/"
xmlns:tns="http://schemas.microsoft.com/clr/nsassem/PlayerHost/PlayerHost%2C%20Version%3D1.
0.0.0%2C%20Culture%3Dneutral%2C%20PublicKeyToken%3Dnull"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:suds="http://www.w3.org/2000/wsdl/suds"
xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:ns2="http://schemas.microsoft.com/clr/nsassem/PlayerHost.Information/PlayerHost%2C%20
Version%3D1.0.0.0%2C%20Culture%3Dneutral%2C%20PublicKeyToken%3Dnull"
xmlns:ns1="http://schemas.microsoft.com/clr/ns/System"
xmlns:ns0="http://schemas.microsoft.com/clr/nsassem/PlayerHost/PlayerHost%2C%20Version%3D1.
0.0.0%2C%20Culture%3Dneutral%2C%20PublicKeyToken%3Dnull"
xmlns:ns3="http://schemas.microsoft.com/clr/nsassem/System.Data/System.Data%2C%20Version%3D
2.0.0.0%2C%20Culture%3Dneutral%2C%20PublicKeyToken%3Db77a5c561934e089"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/">
===================================================

However, when I actually try to call the service from a Asp.Net 2.0
page, I get an error:

===================================================
Unable to import binding 'InformationBinding' from namespace
'http://schemas.microsoft.com/clr/nsassem/PlayerHost/PlayerHost%2C%20Version%3D1.
0.0.0%2C%20Culture%3Dneutral%2C%20PublicKeyToken%3Dnull'.
===================================================

So i tried the wsdl.exe tool and got some more information:

===================================================
Error: Unable to import binding 'InformationBinding' from namespace
'http://sche
mas.microsoft.com/clr/nsassem/PlayerHost/PlayerHost%2C%20Version%3D1.0.0.0%2C%20
Culture%3Dneutral%2C%20PublicKeyToken%3Dnull'.
 - Unable to import operation 'GetEverything'.
 - The datatype
'http://schemas.microsoft.com/clr/nsassem/System.Data/System.Da
ta%2C%20Version%3D2.0.0.0%2C%20Culture%3Dneutral%2C%20PublicKeyToken%3Db77a5c561
934e089:DataTable' is missing.
===================================================

I've tried changing the GetEverything method to return a DataSet, XML
string, MemoryStream but it seems that for any return type outside of
the System namespace I get an error.
I did notice that in the schema definitions above, the System namespace
is defined simply as
xmlns:ns1="http://schemas.microsoft.com/clr/ns/System" but the
System.Data is defined as
xmlns:ns3="http://schemas.microsoft.com/clr/nsassem/System.Data/System.Data%2C%20Version%3D
2.0.0.0%2C%20Culture%3Dneutral%2C%20PublicKeyToken%3Db77a5c561934e089"

Can anyone shed some light on this problem?  I'm not a remoting guru by
any means.