contrary to popular belief, controls generally do not save their values in
viewstate. the browser posts the value, (and the value only). controls
generally store non value information it may need to process the postback
info.
for example the textbox needs to save the previous value, to implement the
onchange event, so the previous (render value) value is stored in
viewstate.it can then compare this to the postback value and tell if its
different.
generally to make you wizard work, you need to save the control values and
restore them, not the viewstate..
-- bruce (sqlwork.com)
"Irene" <> wrote in message
news:F2F840E1-8405-47E2-B4DA-...
> Hello all!
>
> I'm creating a web site in ASP.NET (VB.NET). One of the requirements was
> to
> allow users to create orders going through several steps. A must have is
> to
> have an option to save the work in any phase (any step) and to be able to
> continue later.
>
> My idea was to create several pages as steps (no, wizard control is not
> suitable for several reasons) and to allow users to save any step to the
> database, that is, a ViewState of the page (and page id) to the database.
>
> I created a special Page class that overrides
> LoadPageStateFromPersistenceMedium, SavePageStateToPersistenceMedium,
> DeterminePostBackMode. Saving works great! The loading part sucks.
>
> I have one textbox control for testing and cannot load text to it from
> saved
> viewstate no matter what. Need help, big time.
> Thanks!
>
> Here's the code from my special Page class:
>
> Imports Microsoft.VisualBasic
>
> Public Class SaveStatePage
> Inherits System.Web.UI.Page
>
> Public MeSave As Boolean
>
>
> Protected Overrides Function LoadPageStateFromPersistenceMedium() As
> Object
> If Me.Request.QueryString("IDsession") <> "" Then
> Return Me.LoadSession()
> Else
> Return MyBase.LoadPageStateFromPersistenceMedium()
> End If
>
> End Function
>
>
> Protected Overrides Sub SavePageStateToPersistenceMedium(ByVal state As
> Object)
> If MeSave Then Me.SavePage(state)
>
> MyBase.SavePageStateToPersistenceMedium(state)
> End Sub
>
> Protected Overrides Function DeterminePostBackMode() As
> System.Collections.Specialized.NameValueCollection
> If Me.Request.QueryString("IDsession") <> "" Then
> Return Request.Form
> Else
> Return MyBase.DeterminePostBackMode()
> End If
> End Function
>
> Protected Sub SavePage(ByVal state As Object)
> Dim tmpLosFormatter As New LosFormatter
> Dim tmpStream As New StringWriter
>
> tmpLosFormatter.Serialize(tmpStream, state)
>
> With New DataSetUitlityTableAdapters._viewstateTableAdapter
> .InsertViewState(Session.SessionID, tmpStream.ToString, Now())
> End With
>
> End Sub
>
> Protected Function LoadSession()
> Dim tmpLosFormatter As New LosFormatter
> Dim data As String
>
> Dim tmpTable As DataSetUitlity._viewstateDataTable
> Dim tmpReader As DataTableReader
>
> data = " "
> With New DataSetUitlityTableAdapters._viewstateTableAdapter
> tmpTable =
> .GetDataByIDsession(Me.Request.QueryString("IDsess ion"))
> End With
> tmpReader = tmpTable.CreateDataReader()
> If tmpReader.HasRows Then
> tmpReader.Read()
> Return
> tmpLosFormatter.Deserialize(tmpReader.Item("ViewSt ate").ToString)
> Else
> Return tmpLosFormatter.Deserialize(data)
> End If
>
>
> End Function
>
> Private Sub Page_Load(ByVal sender As Object, ByVal e As
> System.EventArgs) Handles Me.Load
>
> End Sub
> End Class
>
>
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