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CloseReason Enumeration

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 Microsoft Windows Task Manager is closing the application.
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.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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