ViewState variable not retaining its value

[Utpal]

Hi everybody,

In my web form, I have declared a form level variable - vabc. I am trying to retain the value of the variable after a postback using ViewState. Following is my code:

Dim vabc as String
 
    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        If Page.IsPostBack Then
            vabc = ViewState("vabc")
        Else
            vabc = "vParty01"
        End If
    End Sub
 
    Private Sub Page_Unload(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Unload
        ViewState("vabc") = vabc
    End Sub

However, after a postback the value stored in ViewState("vabc") is lost. Why is it not retaining the value? What is the solution?

[wey97]

Page_Unload is not the same in the traditional sense as Windows Forms. The page unload doesn't happen when you close the browser or move to another page. The Page_Unload event happens when the page has finished being processed by ASP.NET, and before it's sent to the browser.

You need to find some other event to set the ViewState on.

Keep in mind, ViewState only saves between page postbacks. If you navigate to another page and back it's lost. For that you need a Session variable.

[Utpal]

The Page_Unload event happens when the page has finished being processed by ASP.NET, and before it's sent to the browser.

Do you mean to say that the ViewState variable should be set after the page has been sent to the browser?

[mendhak]

Remove the Page_Unload event.