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AppDomain.DomainUnload Event

Occurs when an AppDomain is about to be unloaded.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public event EventHandler DomainUnload



The EventHandler delegate for this event can perform any termination activities before the application domain is unloaded.

Each application domain that needs to perform processing when it is unloaded should register an event handler for this event. A shared event handler should not be used, because the EventHandler delegate does not identify the domain that is being unloaded.


This event is never raised in the default application domain.

Do not make assumptions about the thread the event is raised on. The event can be raised on a different thread than the one that called the Unload method.

To register an event handler for this event, you must have the required permissions, or a SecurityException is thrown.

For more information about handling events, see Consuming Events.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0