ASPxUploadProgressHttpHandler processes service callbacks that are automatically initiated by ASPxUploadControl to send an uploaded file packet to the server and to obtain actual information about file upload progress from the server.
Since these service callbacks are intercepted and processed by ASPxUploadProgressHttpHandler, a standard page HTTP handler is not used and Page events (Page_Init, Page_Load etc.) are not called.
ASPxUploadProgressHttpHandler is automatically registered within a web project's Web.Config file when an ASPxUploadControl is placed onto a form in Design view.
The registration code is given below; you can add it manually if it is required (for instance, when you do not use design-time editing and create ASPxUploadControl programmatically).
If one of the sections where ASPxUploadProgressHttpHandler should be registered contains a configSourse attribute, it will be skipped without writing anything to it. To learn more, refer to the ConfigSource Attribute topic.
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