I'm a newbie to .NET and Web Services so I don't know if what I'm about
to ask is  easy or not as it's all over my head at the moment.

I'm trying to display the response of a web service on an aspx page
using a datagrid like this:-

Private Sub Submit_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Submit.Click

    Dim getAvailability As New dialanexchangeavail.IDAEOnlineservice
       Dim AuthID As String
       Dim WebCountryCode As String
       Dim WebRegionCode As String
       Dim Year As Integer
       Dim Month As Integer
       Dim LastDepositID As String

    AuthID = "DEMO-DAE-001"
       WebCountryCode = "A"
       WebRegionCode = "Q"
       Year = 2006
    Month = 11
       LastDepositID = ""

    ' Call the method of the proxy class to initiate the call to the XML
Web service method.

    DataGrid1.DataSource = getAvailability.WSGetAvailability(AuthID,
WebCountryCode, WebRegionCode, Year, Month, LastDepositID)
    DataGrid1.DataBind()

   End Sub

When the button is clicked, you see a wait of about 4 seconds (I'm in
UK, the web service is hosted in Australia) then I get the following
error:-

"An invalid data source is being used for DataGrid1. A valid data
source must implement either IListSource or IEnumerable."

I've read responses on this error in this news group but they don't
relate to web services.  I'm a bit stuck I think.

Any advice would be appreciated.

Regards,

Craig