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CloseReason Enumeration

Updated: July 2010

Specifies the reason that a form was closed.

Namespace:  System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

public enum CloseReason

Member nameDescription
NoneThe cause of the closure was not defined or could not be determined.
WindowsShutDownThe operating system is closing all applications before shutting down.
MdiFormClosingThe parent form of this multiple document interface (MDI) form is closing.
UserClosingThe user is closing the form through the user interface (UI), for example by clicking the Close button on the form window, selecting Close from the window's control menu, or pressing ALT+F4.
TaskManagerClosingThe form is closing because the user clicked End Task in Microsoft Windows Task Manager. Note that if the user ends a process by clicking End Process, the form closes without raising the FormClosing or FormClosed event.
FormOwnerClosingThe owner form is closing.
ApplicationExitCallThe Exit method of the Application class was invoked.

The FormClosing and FormClosed events are raised when a Form is closed, either through user action or programmatically. Handlers for these events receive parameters of type FormClosingEventArgs and FormClosedEventArgs, respectively. Both of these event argument classes use the CloseReason enumeration.

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




July 2010

Clarified description for TaskManagerClosing.

Customer feedback.