How to pass complex object in restful web service - vb.net

Question

I need to pass an object (a list of structures so defined):
Private attivitaDaTrasferire As New List(Of FileDaTrasferire)
Private Structure FileDaTrasferire
Dim activityID As Integer
Dim DataIns As Date
Dim idUtenteComp As Integer
Dim idVersione As Integer
Dim idFile As Integer
Dim fileNome As String
Dim fileDestinazione As String
Dim fileTipoProdotto As String
Dim fileTipo As String
Dim fileBinarySize As Integer
Dim fileBinaryDate As String
Dim fileBinary As Long
End Structure
from a form (vb.net) to a restful web service. How can I do?

Answer 1

Either use JSON or XML for passing it to the restful service.
JSON on .NET
XML-Serializer

Answer 2

I'm using XML-Serializer. I have two functions: one client side:
Private Function SerializeActivity(singolaAttivitaDaTrasferire As List(Of FileDaTrasferire)) As String
Dim writer As New StringWriter()
Dim serializer As New XmlSerializer(GetType(List(Of FileDaTrasferire)))
Try
serializer.Serialize(writer, singolaAttivitaDaTrasferire)
Catch ex As Exception
Console.WriteLine("Eccezione " + ex.Message)
End Try
Return writer.ToString()
End Function
and one for the web-service.I get the xml file from the web service as a string and try to deserialize it with this function:
Public Function SaveDataPost(sXMLFile As String) As Boolean Implements ILiveUpdateWS.SaveDataPost
Dim reader As New StringReader(sXMLFile)
Dim serializer As New XmlSerializer(GetType(List(Of FileDaAggiornare)))
Dim myFile As List(Of FileDaAggiornare)
'Dim myFile As FileDaAggiornare
Try
myFile = serializer.Deserialize(reader)
Catch ex As Exception
Console.WriteLine("Eccezione: " + ex.Message)
End Try
Return Nothing
End Function
but on the deserialize I obtain an InvalidOperationException. (Error in the xml document)