A method that will handle the ASPxCallback.Callback event.
public delegate void CallbackEventHandler( object source, CallbackEventArgs e );
Public Delegate Sub CallbackEventHandler( source As Object, e As CallbackEventArgs )
A CallbackEventArgs object that contains event data.
When creating a CallbackEventHandler delegate, you identify the method that will handle the corresponding event. To associate an event with your event handler, add a delegate instance to the event. The event handler is called whenever the event occurs unless you remove the delegate. For more information about event handler delegates, see Events and Delegates in MSDN.