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CannotUnloadAppDomainException Class

The exception that is thrown when an attempt to unload an application domain fails.

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

public class CannotUnloadAppDomainException : SystemException

CannotUnloadAppDomainException is thrown when there is an attempt to unload the following:

  • The default application domain, which must remain loaded during the lifetime of the application.

  • An application domain with a running thread that cannot immediately stop execution.

  • An application domain that has already been unloaded.

CannotUnloadAppDomainException uses the HRESULT COR_E_CANNOTUNLOADAPPDOMAIN, which has the value 0x80131015.

For a list of initial property values for an instance of CannotUnloadAppDomainException, see the CannotUnloadAppDomainException constructors.


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

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

.NET Compact Framework

Supported in: 3.5, 2.0

XNA Framework

Supported in: 3.0, 2.0, 1.0