Update panel not adding new controls but shows the new ones

Question

Well when working with a simple example it works but when I load a control from other panel and build and then add it to update panel it doesn't update the controls of it. The example here is working :

<asp:UpdatePanel ID="updatePanelRepeater" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="true">
    <ContentTemplate>
        <asp:Panel ID="allAccResults" runat="server">
        </asp:Panel>
        <asp:Label ID="Label21" runat="server" Text="Label"></asp:Label>
        <asp:ListBox ID="lbLog" runat="server"></asp:ListBox>
        <asp:Button ID="loadMoreAccResultsButton" CssClass="loadMoreAccResultsButton" runat="server" Text="load More" OnClick="loadMoreAccResultsOnPanel" />
    </ContentTemplate>
</asp:UpdatePanel>

When async post back happends it triggers below the function and it works fine by adding controls

        lbLog.Items.Add(Guid.NewGuid().ToString())
        allAccResults.Controls.Add(lbLog)

When I load a control and build it and then add it to panel it only adds the new ones not every new one control to the previous added so it ends up adding only new controls every time while I need all controls from beggining to end

        For icount As Integer = TenResultsDataStart To TenResultsDataEnd
            m_rbNum = m_rbNum + m_resPerPage
            m_accsingleresult = New AccomodationSingleResult
            m_accsingleresult = LoadControl("AccomodationSingleResult.ascx")
            m_accsingleresult.BuiltControl(m_accResults(icount), m_rbNum)
            allAccResults.Controls.Add(m_accsingleresult)
        Next

Also when debugging allAccResults.Controls.Count is not increasing from 10 to 20 to 30 it just clears it every time without any line code doing Clear of controls and keeps doing it 10 then again from 0 10 and again and again

Answer 1

Ok I have found out how it can be done by adding a new panel every time and the new controls in each new panel. So I just add a counter in page load in a session and if it's async postback then it will increment.

   Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    If Not (Page.IsPostBack) Then
        Session.Item("IndexOfAll") = 0
        loadMoreAccResultsOnPanel()
    End If
    If (ScriptManager.GetCurrent(Page).IsInAsyncPostBack) Then
        Session.Item("IndexOfAll") += 1
    End If
End Sub

And the function that is triggered from button with async postback

Protected Sub loadMoreAccResultsOnPanel()

    For i As Integer = 0 To Session.Item("IndexOfAll")
        Dim pnl As Panel = New Panel()
        pnl.ID = "PAnel" & i.ToString()
        Dim m_accsingleresult As WebUserControl1
        m_accsingleresult = New WebUserControl1
        m_accsingleresult = LoadControl("WebUserControl1.ascx")
        m_accsingleresult.ID = "m_accsingleresult" & i.ToString()
        m_accsingleresult.builtcontrol()
        allAccResults.Controls.Add(pnl)
        pnl.Controls.Add(m_accsingleresult)
    Next
End Sub

As for the WebUserControl1

Public Sub builtcontrol()
    lbLog.ID = Guid.NewGuid().ToString()
    For i As Integer = 1 To 10
        lbLog.Items.Add(i.ToString() + "___" + Guid.NewGuid().ToString())
    Next
End Sub