I have 2 webforms called OrderPage and ArticlePage.

OrderPage is a dynamical datagrid, that grown by clicking on a "add new row" button
By clicking on this button, a datatable growns also (dataTable made in page_load of webform OrderPage

That DataGrid is also containing a button that when pushed redirect the page to ArticlePage
There i want to manipulate the tables of that DataSet...
So i put the dataSet into a Session and try to call it back in the 2nd webfrom ArticlePage,
Call it back is no problem, but the compiler says he don't know any of the tables made in the first webform OrderPage, while i did save it to the Session in the Page_Load...

I get this message:

The IListSource does not contain a data source named 'OrderTabel'.
my first application was exactly the same, unless i didn't redirect there and all controls were in 1 webform. There i had to put the visibility-style each time i changed, so it seems me more maintable to work with 2 webforms, interacting each other with the Redirect and the data in the DataSet...

Somebody knows where the problem is?
A Session seems me to be a "kind" (i know, with sessionid-cookie...) cookie so why can't i get those tables????

webform orderPage:

Public Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    If Not IsPostBack Then
        'Declareer een DataSet
        Dim myDataSet As New DataSet()
        'Declareer een DataTable OrderTabel die dan binnen die dataSet moet komen
        Dim myDataTable As DataTable = New DataTable("OrderTabel")
        'Voeg de kolommen van de DataTable in
            myDataTable.Columns.Add("klantid", System.Type.GetType("System.String"))
            myDataTable.Columns.Add("artikelid", System.Type.GetType("System.String"))
            myDataTable.Columns.Add("anaam", System.Type.GetType("System.String"))
            myDataTable.Columns.Add("prijs", System.Type.GetType("System.Double"))

            myDataTable.Columns.Add("totaleprijs", System.Type.GetType("System.String"))
            myDataTable.Columns.Add("datum", System.Type.GetType("System.DateTime"))
            myDataTable.Columns.Add("aantal", System.Type.GetType("System.String"))
    'Voeg de dataTable toe aan de dataSet
    myDataSet.Tables.Add(myDataTable)

    Dim objArray(6) As Object
    'eerst blanco regel invoeren
    objArray(0) = hiddenKlantID.Text
'klantid
    objArray(1) = "-1"
'artikelid
    objArray(2) = ""
'anaam
    objArray(3) = "0"
'prijs
    objArray(4) = "0"
'totale prijs
    objArray(5) =
Date.Today() 'Datum
    objArray(6) = ""
'Aantal
    myDataTable.Rows.Add(objArray)


    Dim myDropDownTable As DataTable = New DataTable("DDLTabel")
    myDropDownTable.Columns.Add("aantal", System.Type.GetType("System.String"))
    myDataSet.Tables.Add(myDropDownTable)

    Dim objDataRow As DataRow
    Dim x As Integer
    For x = 1 To 10 Step 1
        objDataRow = myDropDownTable.NewRow
        objDataRow("aantal") = x
        myDropDownTable.Rows.Add(objDataRow)
    Next

    Session("data") = myDataSet

    DataGrid1.DataSource = myDataSet
    DataGrid1.DataMember = "OrderTabel"
    DataGrid1.DataBind()

End If
End Sub

Private
Sub handlesCommandsDataGrid1(ByVal objSender As System.Object, ByVal objArgs As DataGridCommandEventArgs) Handles DataGrid1.ItemCommand
    If objArgs.CommandSource.CommandName = "Kies" Then
        Dim index = objArgs.Item.DataSetIndex
        Dim myURL = ".\Articlepage.aspx?index=" & index
        Response.Redirect(myURL)
    End If

End Sub

Private
Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    If Not IsPostBack Then
    'Declareer een DataSet
    Dim myDataSet As New DataSet()

    'Declareer een tweede DataTable ArtikelTabel die binnen dataSet moet komen
    Dim myArtTable As DataTable = New DataTable("ArtikelTabel")

    'Vul de ArtikelTabel via de SqlDataAdapter2
    SqlDataAdapter1.Fill(myArtTable)
    'voeg die ArtikelTabel toe aan de dataset   
    myDataSet.Tables.Add(myArtTable)


    'Bind op een dataGrid
    Session("data") = myDataSet
    DataGrid2.DataSource = myDataSet
    DataGrid2.DataMember = "ArtikelTabel"
    DataGrid2.DataBind()

    Dim mytabel = myDataSet.Tables("OrderTabel")
    DataGrid3.DataSource = myDataSet
    DataGrid3.DataMember = "OrderTabel"
    DataGrid3.DataBind()

End If
End Sub