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When using a Web Mapping Application built with the 9.3 .NET Web ADF, clicking the FullExtent button or using the ZoomTo/PanTo options on a task result can crash the application with the following error:
Object reference not set to an instance of an object.
Int32 viewWidth, Int32 viewHeight, Double mapRotationInDegrees,
TransformationDirection direction, SpatialReference spatialReference) at
The OverviewMap's OverviewMapResource property is not set to a valid resource item.
This can easily occur when the map resource item that the OverviewMap is set to display is renamed or deleted in the MapResourceManager.