Specifies the reason that a form was closed.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
|The Exit method of the Application class was invoked.|
|The owner form is closing.|
|The parent form of this multiple document interface (MDI) form is closing.|
|The cause of the closure was not defined or could not be determined.|
|The Microsoft Windows Task Manager is closing the application.|
|The 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.|
|The operating system is closing all applications before shutting down.|
Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.