Handling events of usercontrols within listview - asp.net

Question

I have a simple usercontrol which raises an event on button click
Public Class UcPaymentCheque
Inherits System.Web.UI.UserControl
Public Event OnCancelClick()
Private Sub btnCancelPayment_Click(sender As Object, e As System.EventArgs) Handles btnCancelPayment.Click
RaiseEvent OnCancelClick()
End Sub
End Class
This usercontrol is used within a listview
<asp:ListView ID="lvwNonTpProducts" runat="server" ItemPlaceholderID="ItemPlaceholder">
<LayoutTemplate>
<asp:PlaceHolder ID="ItemPlaceholder" runat="server" />
</LayoutTemplate>
<ItemTemplate>
<TPCustomControl:UcPaymentCheque ID="UcTPPaymentCheque" runat="server" Visible="false" />
</ItemTemplate>
</asp:ListView>
which is databound on page load
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Page.IsPostBack Then
Else
BuildPage()
End If
End Sub
At what point should add the handler? I have fiddled with the ondatabound event like so;
Private Sub lvwNonTpProducts_ItemDataBound(sender As Object, e As System.Web.UI.WebControls.ListViewItemEventArgs) Handles lvwNonTpProducts.ItemDataBound
Dim UcTPPaymentCheque = DirectCast(e.Item.FindControl("UcTPPaymentCheque"), UcPaymentCheque)
AddHandler UcTPPaymentCheque.OnCancelClick, AddressOf OnCancelClick
End Sub
but this does not work and am guess at a databound issue???

Answer 1

You can check out my response to a similar question here: creating and listening for events
Essentially, you want a user control to raise its own event, like this:
Partial Class myControl
Inherits System.Web.UI.UserControl
Public Event MyEvent As EventHandler
'your button click event
Protected Sub bnt_click(ByVal sender As Object, ByVal e As EventArgs)
'do stuff
'now raise the event
RaiseEvent MyEvent (Me, New EventArgs)
end sub
end class
In this example, I raise the event when the user clicks a button within the user control. You can easily raise the event anywhere, such as when the control loads, using a timer, whatever.
Then, in the main page, you want to and an event handler to the user control, like this:
<mc:myControlrunat="server" ID="myControl1" OnMyEvent="myControl_MyEvent" />
Now, in the code behind, you can add the event, like this:
Protected Sub myControl_MyEvent(ByVal sender As Object, ByVal e As EventArgs)
'do stuff
end sub

Answer 2

You can add the handler in the declaration of the user control in the listview, using OnCancelClick, as follows:
<asp:ListView ID="lvwNonTpProducts" runat="server" ItemPlaceholderID="ItemPlaceholder">
<LayoutTemplate>
<asp:PlaceHolder ID="ItemPlaceholder" runat="server" />
</LayoutTemplate>
<ItemTemplate>
<TPCustomControl:UcPaymentCheque ID="UcTPPaymentCheque" runat="server" Visible="false" OnCancelClick="UcTPPaymentCheque_OnCancelClick" />
</ItemTemplate>
</asp:ListView>
Where UcTPPaymentCheque_OnCancelClick is the function you should use to handle the event, in the control that contains the listview.