DropDownList is losing state when using an UpdatePanel

[Yovav]

Dear Gurus,

I have an UpdatePanel with a DropDownList
(AutoPostBack="true")

Its being triggered in the UpdatePanel like this
<AJAX:AsyncPostBackTriggerControlID="_benefitGroup"EventName="SelectedIndexChanged"/>

The problem is that every refresh to the page causes the drop down to lose it's state,

How can I make it remember the last selection state without using the session ?

(what is wrong with the ViewState / UpdatePanel ?)

[wildfrog]

It depends on how you fill your drop down list with data. Try avoid changing the drop down during postbacks:

If (Not Page.IsPostBack) Then
    DropDownList1.Items.Add("a")
    DropDownList1.Items.Add("b")
    DropDownList1.Items.Add("c")
    DropDownList1.Items.Add("d")
End If

- petter