What causes the ‘Cannot unregister UpdatePanel’ error

asp.netasp.net-ajaxupdatepanel

I've got a UserControl that contains an UpdatePanel. When I put that on a page, it throws the following error:

Cannot unregister UpdatePanel with ID
'ReviewContentUpdatePanel' since it
was not registered with the
ScriptManager. This might occur if the
UpdatePanel was removed from the
control tree and later added again,
which is not supported. Parameter
name: updatePanel

ReviewContentUpdatePanel is the name of the update panel & it's not being removed or added in code, it exists in the aspx page and isn't removed. Has anyone come across this before?

Best Answer

This error occurs when the Controls collection in which the UpdatePanel is resided is cleared using the Clear method, or when the specific UpdatePanel is removed using the Remove method.

A trigger for these methods could be the implementation of the CreateChildControls method for the control contains the UpdatePanel. Usually, you call Controls.Clear() in the top of this method, to start with a clean slate if this method is called repeatedly.

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I do not think this is possible. I have tried it several different ways. You might have to bite the bullet and put a scriptmanager in your page.

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According what I understand the textbox is embedded on User Control dtmDateFirstEntry. You CANNOT use directly a control contained by a user control. The user control MUST expose the events of his child controls if you want to use them as triggers.

<asp:UpdatePanel ID="upIntendedStay" runat="server" UpdateMode="Conditional">
    <Triggers>
        <asp:AsyncPostBackTrigger ControlID="dtmDateFirstEntry" EventName="DateChanged" />
    </Triggers>
    <ContentTemplate>
        <asp:Label ID="Label4" runat="server" Text="Update tHis text from server" CssClass="ErrorText"></asp:Label>
    </ContentTemplate>
</asp:UpdatePanel>

DateChanged would be an event exposed by dtmDateFirstEntry. Do you know how to do this?

Best Answer

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