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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
ApplicationExitCallThe Exit method of the Application class was invoked.
FormOwnerClosingThe owner form is closing.
MdiFormClosingThe parent form of this multiple document interface (MDI) form is closing.
NoneThe cause of the closure was not defined or could not be determined.
TaskManagerClosingThe Microsoft Windows Task Manager is closing the application.
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.
WindowsShutDownThe operating system is closing all applications before shutting down.

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: 4.6, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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