can we access viewstate and session objects at unload event of page

Question

can we access viewstate and session objects at unload event of page.

Answer 1

The "unload" event is called as soon as the page response has been sent to the client browser, there's usually nothing useful you can do in this event, other than clear up resources (i.e. file/database handles, etc).

Unload is called after the page has been fully rendered, sent to the client, and is ready to be discarded. At this point, page properties such as Response and Request are unloaded and any cleanup is performed.

[...]

During the unload stage, the page and its controls have been rendered, so you cannot make further changes to the response stream. If you attempt to call a method such as the Response.Write method, the page will throw an exception. (From ASP.NET Page Life Cycle Overview).

You might possibly be able to read viewstate, you certainly can't change it, and the same propbably holds true for session. What are you trying to achieve?

Answer 2

yes offcourse, try the following :

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles 

Me.Load
        Session("test") = "testing"
    End Sub

    Protected Sub Page_Unload(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Unload
        Dim str As String = Session("test")
        Response.Write(str)
    End Sub

Answer 3

In another event, save the viewstate you want to save.

Then in the Page_Unload event, call this.SaveViewState(). The view state you already saved will be updated with any changes.

The reason I needed this was to capture input from users in dynamically created controls.