IsValid

'NOTE: A Service Reference to the web service must be added to use this sample code.
Private Sub IsValid(ByVal postcode As String)
    'Declare the required options.
    'Invoke the web service method.
    Dim proxy As PostcodeVerifySoapClient = New PostcodeVerifySoapClient()
    Dim results As PostcodeVerifyOutput = proxy.IsValid("your-username", "your-password", postcode, New [Option](-1) {})
    'Check that the call succeeded, and show the error message if there was a problem.
    If (results.Status.Success = false) Then
        MessageBox.Show(("Error: " + results.Status.ErrorMessage))
    Else
        'TODO: Process method results here.
        'Results can be extracted from the following fields:
        'result.ValidPostcode
        '  Indicates if the supplied `postcode` is valid
        'result.FormattedPostcode
        '  The supplied `postcode` changed to a standardised format
        'result.AlternativePostcodes
        '  A list of other valid postcodes which are potential mistypings of the supplied `postcode`.
    End If
End Sub

Public Sub IsValid(postcode As String)
  Dim rs As ADODB.Recordset
  Set rs = New ADODB.Recordset
  rs.Open "https://webservices.data-8.co.uk/recordset.ashx?service=PostcodeVerify&method=IsValidSimple" &
    "&username=your-username" &
    "&password=your-password" &
    "&postcode=" & postcode
  If rs.MoveFirst Then
    If rs.Fields(0).Name = "Success" And rs.Fields(0).Value = false Then
      MsgBox "Error: " & rs.Fields(1)
    Else
      'TODO: Process method results here.
      'All the results are available in the first row in the recordset.
      'Results can be extracted from the following fields:
      'ValidPostcode
      '  Indicates if the supplied `postcode` is valid
      'FormattedPostcode
      '  The supplied `postcode` changed to a standardised format
      'Each result is available in a different row in the recordset.
      'Results can be extracted from the following fields:
      'Item
    End If
  End If
End Sub