Button on WebUserControl click events not firing

[NickThissen]

Hi,

I have a WebUserControl with a Button and some other controls (placeholder for images, labels). On a certain page, a number of these WebUserControls are created (using Me.LoadControl) and added to a PlaceHolder on the page.

When the user clicks the button on either of these usercontrols, I want a method on the page to be called. I have been doing this by handling the Button Click event on the usercontrol, and then letting the usercontrol raise another event. I use AddHandler after creating the usercontrol to add an eventhandler method to this custom event.

Sounds confusing? Here's a simple example.

The WebUserControl:

<%@ Control Language="vb" AutoEventWireup="false" CodeBehind="TestControl.ascx.vb" Inherits="CSLimitedEdition.Controls.TestControl" %>
<asp:Button runat="server" ID="btn" Text="Button" />

Namespace Controls
    Public Class TestControl
        Inherits System.Web.UI.UserControl
 
        Public Event ButtonClicked As EventHandler
 
        ' Just some property to test with
        Public Property Number As Integer
 
        Protected Sub btn_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btn.Click
            ' When the button is clicked, raise a ButtonClicked event to handle on the Page
            RaiseEvent ButtonClicked(Me, e)
        End Sub
 
    End Class
End Namespace

The Page to place a number of these controls on:

<%@ Page Title="" Language="vb" AutoEventWireup="false" MasterPageFile="~/Site.Master" CodeBehind="TestPage.aspx.vb" Inherits="CSLimitedEdition.Pages.TestPage" %>
<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
 
    <p>
        <asp:Label runat="server" ID="lbl" />
    </p>
    <p>
        <asp:PlaceHolder runat="server" ID="placeHolder" />
    </p>
 
</asp:Content>

Imports CSLimitedEdition.Controls
 
Namespace Pages
    Public Class TestPage
        Inherits System.Web.UI.Page
 
        Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
            If Not Me.IsPostBack Then
                Me.AddControls()
            End If
        End Sub
 
        Private Sub AddControls()
            For i As Integer = 1 To 5
                ' Create the control
                Dim c As TestControl = DirectCast(Me.LoadControl("~/Controls/TestControl.ascx"), TestControl)
 
                ' Set some property for testing and add event handler
                c.Number = i
                AddHandler c.ButtonClicked, AddressOf TestControl_ButtonClicked
 
                ' Add it to the place holder
                placeHolder.Controls.Add(c)
            Next
        End Sub
 
        Private Sub TestControl_ButtonClicked(ByVal sender As Object, ByVal e As EventArgs)
            ' When a button on a usercontrol is clicked, set the label text to the 'Number' property of that control
            Dim c As TestControl = DirectCast(sender, TestControl)
            lbl.Text = c.Number.ToString()
        End Sub
 
    End Class
End Namespace

The idea is this:

1. Button is clicked on the TestControl: TestControl.ButtonClicked event is raised.
2. On the TestPage, the TestControl_ButtonClicked method is called
3. The Number property of the calling TestControl is assigned to a label so I can see it.

However, it seems that the TestControl_ButtonClicked method is never called.

Via debugging I can confirm that the Button Click event, on the TestControl usercontrol, is fired, so that the TestControl.btn_Click method is called. The TestControl.ButtonClicked event is raised.
After creating a TestControl, the AddHandler statement is executed.

After clicking a button on the page however, nothing happens. The page just posts back, all the buttons are gone (ok, I'm not loading them again in case of a postback), but the label does not get the text.

In fact, the ButtonClick handler method (TestPage.TestControl_ButtonClicked) method is never called!


What could be causing this? I am sure that I have been using this method a few weeks ago, in this very project, yet suddenly it has stopped working. I thought it might be a one-time thing but with these new TestControl and TestPage the same thing happens.
EDIT
The same thing happens also in a completely new and separate project. I don't get it, this WAS working..?!


Help?