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?