SPLongOperation is used for executing the long process in SharePoint

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SPLongOperation only starts at operation end

I'm using an AppPage showed up in a ModalDialog and when I click on a button action I try to start a SPLongOperation process, but it only shows the processing panel right before it ends. here is the ...
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Using SPLongOperation Within ItemUpdating Event Receiver

I have an event receiver triggered on ItemUpdating that may take some time to run. The code is as follows: using (SPLongOperation longOperation = new SPLongOperation()) { //Custom Messages on ...