A method that will handle the LayerBase.ViewportChanged event.
public delegate void ViewportChangedEventHandler( object sender, ViewportChangedEventArgs e );
Public Delegate Sub ViewportChangedEventHandler( sender As Object, e As ViewportChangedEventArgs )
The event source.
A ViewportChangedEventArgs object that contains event data.
When creating a ViewportChangedEventHandler delegate, you identify the method that will handle the corresponding event. To associate an event with your event handler, add a delegate instance to this 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.