Drop down items missing after postback

This sounds like a dumb questions even as I am writing it, but I am adding items to a drop down list in the OnLoad.  The dropdown has autopost back enabled.  When I run it the app on the webserver and change the year in the drop down list the items I added dynamically disappear.  When I am debugging, they don't disapper.

<asp:DropDownList ID="ddlYears" runat="server" AutoPostBack="true">
        </asp:DropDownList>

'Populate ddlYears
            For i As Int32 = DateTime.Now.Year - 1 To (DateTime.Now.Year + 2)

                Dim ddlEntry As New ListItem(i.ToString(), i.ToString())
                If i = DateTime.Now.Year Then
                    ddlEntry.Selected = True
                End If
                ddlYears.Items.Insert(ddlYears.Items.Count, ddlEntry)
            Next
LVL 2
smcdrcAsked:
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Munawar HussainConnect With a Mentor Principal Software EngineerCommented:
Even you add Items at runtime / dynamically .. does not matter.it should keep items saved. the only condition where it could lost items is .. if you are filling dropdownlist javascrip at client side then during postback you will most likely lose items.
Is it possible to post same code (ASPX + CS) ? I may check that?
Thanks
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Munawar HussainPrincipal Software EngineerCommented:
FIRST make sure you it is inside postback

if (!isPostback)
{
populate here
}

2nd check ViewState it should be enabled

 <asp:DropDownList ID="DropDownList1" EnableViewState="true"  runat="server">
        </asp:DropDownList>
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smcdrcAuthor Commented:
It is in the !isPostBack and viewstate is enabled.  These are dynamically entered at run time.  
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