Hi,

New user first post...

I have an application running vb.net.
The snippets of code below work when tested within Visual Web Developer 2005 Express.
They work when I debug using Cassini as the target server.
But when I run under the Cassini service the postback fails to find the control _owner.

At run time Panel1 has a number of new panels added to it that the postback code then loops round. But since "_owner" is not found all the code is bypassed.

Can anybody shed any light on the cause of the problem please.

Thanks in advance.


<asp:TableRow>
<asp:TableCell>
<asp:Panel ID="Panel1" runat="server" EnableViewState="true" HorizontalAlign="Center">
</asp:Panel>
</asp:TableCell>
</asp:TableRow>

VB setup snippet

Dim ownerPanel As Panel = New Panel()
ownerPanel.HorizontalAlign = HorizontalAlign.Center
ownerPanel.ID = "_owner"
...
...
...
ownerPanel.ScrollBars = ScrollBars.Auto
Panel1.Controls.Add(ownerPanel)


Then on postback

Dim ownerPanel As Panel = Panel1.FindControl("_owner")
If Not ownerPanel Is Nothing Then
For p As Integer = 0 To ownerPanel.Controls.Count - 1
...
... etc


.NET Framework V 2.0.50727
Cassini 2.0.8

Hi,

Thanks for the quick response.

Panel1 is as defined in the Asp snippet.

The page is initially displayed and data selected from a dropdown box. the data related to that dropdown value is then displayed. This is accomplished by adding further panels to panel1, the first of which has an id of _owner. Subsequent data is then displayed within these giving a set of nested panel:

Panel1 contains _owner which in turn contains pan0, pan1,pan2 etc. The number of final panels is data based hence the programmatic generation rather than through aspx.

Panel1 is therefore just the aspx defined home for the programmatically generated controls.

As part of my attempt to ascertain what was going on I inserted the following code

Dim message As String = "Controls in panel1 = " + Panel1.Controls.Count.ToString + vbCrLf
For x As Integer = 0 To Panel1.Controls.Count - 1
message = message + "Control_" + x.ToString + " ID=" + Panel1.Controls(x).ID + vbCrLf
For y As Integer = 0 To Panel1.Controls(x).Controls.Count - 1
message = message + "Sub_Control_" + y.ToString + " ID=" + Panel1.Controls(x).Controls(y).ID + vbCrLf
Next
Next
MessageLb2.Text = message

the result of which was:
Controls in panel1 = 1 Control_0 ID=

Implying that the control is there but has lost its ID as well any child controls.

This failure is happening in FireFox and IE7

Rob

Page_Init if page is postback

Button1_Click

Button2_Click

Each of the above call the sub routine that populates Panel1.

Button1 is used after the dropdown item has been selected this results in the data being populated for editing.
When ready button2 is pressed to apply the updates. It is at the start of button2_click that the Postback code is executed - and fails. When it works the database is updated, Panel1 is cleared and re-populated with the refreshed data.

Not quite sure why it is in the page_init - I can never remember the sequence that these things get called.

Rob

Ok thanks for that. I will have a play tomorrow.
Rob