ArcGIS Engine Developer Guide

WORKING WITH THE ARCGIS CONTROLS
LicenseControl will initially try to initialize the application with an ArcGIS
Engine license (the lower license). If that license is not available, the
LicenseControl will try to initialize the application with an ArcView license (the
next higher level license selected). If no product licenses are available, then the
application will fail to initialize. Note that once an application is initialized with
a product license, it is not possible to reinitialize the application for the duration
of the application’s life.
Extensions
Select the extension licenses required by the application. Not every extension
license is available with every product license; as such the list of available extension
licenses will change as different product licenses become selected. The availability
of each extension license is checked in conjunction with the product
license with which the application will ultimately be initialized. If any of the
selected extensions are not available, the application will fail to initialize. The
LicenseControl will check out extensions directly after the application is initialized
and will check in extensions when the application is shutdown.
If a SceneControl or GlobeControl (requiring the 3D Analyst extension) is embedded
within the same container as the LicenseControl, the 3D Analyst extension
will automatically be checked.
Shutdown
Set whether the LicenseControl will automatically shut down the application if
license initialization fails. If the LicenseControl handles license initialization
failure, a License Failure dialog box will be displayed to the user before the
application is shut down. If the developer handles license initialization failure,
the LicenseAvailability, Status, and Summary properties can be used to obtain
information on the nature of the failure before the application is programmatically
shut down.
Chapter 3 • Developing with ArcGIS controls • 49