ItemCommand of DataList in UpdatePanel is not fired on Postback - asp.net

Question

I have a popup panel which contains an UpdatePanel, which contains a DataList. Table rows are populated using ItemTemplate and there is a LinkButton generated on each row for deleting this row. I would like to delete this record in the DataList's ItemCommand event handler and rebind the DataList.
However, after I click a "delete" button in the DataList, ItemCommand is not fired. I've already checked if IsPostBack in my Page_Load and only do Datalist.Databind() if it's not a postback. Normally I would expect first Page_Load and then list_ItemCommand being called after I click a delete button in the DataList, but list_ItemCommand is not called as expected. And nothing is then displayed in DataList which is inside the UpdatePanel.
And stranger, if I remove the IsPostBack check in Page_Load, that being said, rebind the DataList in every Page_Load, ItemCommand will be caught and list_ItemCommand is called. This is against the answers in many other posts "ItemCommand event will be canceled if DataList is rebinded during PostBack".
Code behind:
Protected records As New List(Of Record)
Protected Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Set some page properties...
If Not Page.IsPostBack Then
GetListOfRecordFromDatabase()
datalist.DataSource = records
datalist.DataBind()
End If
End Sub
Protected Sub datalist_ItemCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataListCommandEventArgs) Handles datalist.ItemCommand
Select Case e.CommandName.ToLower
Case "delete"
For Each c As Record In records
If c.Id = e.CommandArgument Then
records.Remove(c)
Exit For
End If
Next
DeleteRecordFromDatabase(e.CommandArgument)
datalist.DataSource = records
datalist.DataBind()
End Select
End Sub
Controls:
<asp:Content ID="content1" runat="server" ContentPlaceHolderID="Content1PlaceHolder">
<asp:LinkButton ID="btnpopup" runat="server" OnClientClick="javascript:return popup()"></asp:LinkButton>
<asp:ScriptManagerProxy ID="ScriptManagerProxy1" runat="server" EnableViewState="false" >
</asp:ScriptManagerProxy>
<asp:Panel ID="PanelPopup" runat="server" style="display:none;">
<asp:UpdatePanel ID="UPPopup" runat="server" UpdateMode="conditional" EnableViewState="false">
<ContentTemplate>
<div id="divPopup1" runat="server">
<table id="table1" cellpadding="2" cellspacing="1" width="500" border="0" >
<asp:DataList ID="datalist" runat="server" OnItemCommand="datalist_ItemCommand">
<ItemTemplate>
<tr align="center">
<td><%#Container.ItemIndex +1 %></td>
<td><asp:Label ID="Label1" runat="server" Text='<%# eval("Name") %>'></asp:Label></td>
<td><asp:Label ID="Label2" runat="server" Text='<%# eval("Color") %>'></asp:Label></td>
<td><asp:LinkButton ID="Delete" CommandName="Delete" runat="server" Text="Delete" CommandArgument='<%# eval("Id") %>' ></asp:LinkButton></td>
</tr>
</ItemTemplate>
</asp:DataList>
</table>
</div>
</ContentTemplate>
</asp:UpdatePanel>
<div style="text-align:center;"><br />
<asp:Button ID="BtnSavePopup" runat="server" Text="Save and Close"/>
</div>
</asp:Panel>
<script type="text/javascript">
function popup() {
return mypagehelper.openAsModalPopup("<% =PanelPopup.ClientID%>");
}
</script>
</asp:Content>
Further more, I tried to grab the ControlID and the Control who raised the event during Postback using this code:
If IsPostBack Then
Dim CtrlID As String = String.Empty
If Request.Form("__EVENTTARGET") IsNot Nothing And
Request.Form("__EVENTTARGET") <> String.Empty Then
CtrlID = Request.Form("__EVENTTARGET")
Dim postbackControl As System.Web.UI.Control = Page.FindControl(CtrlID)
Else
End If
And I found that I can get my CtrlID as "ctl00$datalist$ctl08$Delete" but the postbackControl is Nothing. While on my other normal pages I can get both the controlID and actual control(which is a LinkButton) who raised the event.

Answer 1

Remove EnableViewState="false" from update panel.

Answer 2

it's late answer but i faced in soon, also may be it help some one else ...
the CommandName="Delete" is reserved for DataList "OnItemDeleting" Event
so just changing the CommandName to anything else (for example "Remove") will help or handle the OnItemDeleting Event.