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Ticket Q314549
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Databinding expressions are only supported on objects that have a DataBinding event

created 14 years ago

Why would this code work
 <dx:ASPxButton ID="btnAbbrechen" runat="server" AutoPostBack="False" Text="Abbrechen"
                            EnableClientSideAPI="True" ClientSideEvents-Click='<%# KundenAuswahlAbbrechenClickHandler() %>'>
                        </dx:ASPxButton>
And this one not:
  <dx:ASPxButton ID="btnAbbrechen" runat="server" AutoPostBack="False" Text="Abbrechen"
                            EnableClientSideAPI="True">
                            <ClientSideEvents Click='<%# KundenAuswahlAbbrechenClickHandler() %>' />
                        </dx:ASPxButton>
?
The second throws an error: Databinding expressions are only supported on objects that have a DataBinding event. AspxButton does not have a DataBinding event.
I know how to handle the code right, I just want to know why the second option won't work? I always thought that it is just another way of setting properties for a WebControl?!
Thanks
Stefan

Comments (1)
DevExpress Support Team 14 years ago

    Hello Stefan,
    The ClientSideEvents object is not inherited from the control that supports the DataBinding event. It is a settings property that is used to register client-side events.
    However, when you use the ClientSideEvents-Click property, the ASP.NET framework sees that you are using a data-binding expression in the context of the ASPxButton control (that has the mentioned event).
    That is why data-binding works fine.
    You can also examine another approach of runtime event handler initialization. Please check our KB article: The general technique of using the Init/Load event handler.
    Thanks,
    Vest

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