Problem retrieving multiple instances of the same asp.net session variable
- by sw1sh
I'm having problems with retrieving multiple instances of a session variable from an InProc session state.
In the following code I persist a simple BusinessObject into a session variable on the Page_Load event. On the click of a button I try to retrieve the object back into 2 new declared instances of the same BusinessObject.
All works great until I change one of the properties in the first instance, it changes the second instance as well.
Is this normal behaviour? I would have thought as these were new instances they wouldn’t demonstrate static behaviour?
Any ideas where I'm going wrong?
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not Page.IsPostBack Then
' create a new instance of a business object and set a containg variable
Dim BO As New BusinessObject
BO.SomeVariable = "test"
' persist to inproc session
Session("BO") = BO
End If
End Sub
Protected Sub btnRetrieveSessionVariable_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnRetrieveSessionVariable.Click
' retrieve the session variable to a new instance of BusinessObject
Dim BO1 As New BusinessObject
If Not Session("BO") Is Nothing Then BO1 = Session("BO")
' retrieve the session variable to a new instance of BusinessObject
Dim BO2 As New BusinessObject
If Not Session("BO") Is Nothing Then BO2 = Session("BO")
' change the property value on the first instance
BO1.SomeVariable = "test2"
' why has this changed on both instances?
Dim strBO1Property As String = BO1.SomeVariable
Dim strBO2Property As String = BO2.SomeVariable
End Sub
' simple BusinessObject class
Public Class BusinessObject
Private _SomeVariable As String
Public Property SomeVariable() As String
Get
Return _SomeVariable
End Get
Set(ByVal value As String)
_SomeVariable = value
End Set
End Property
End Class
