Occurs when the application is about to shut down.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
You must attach the event handlers to the Exit event to perform unhandled, required tasks before the application stops running. You can close files opened by this application, or dispose of objects that garbage collection did not reclaim.
Because this is a static event, you must detach any event handlers attached to this event in the event handler itself. If you do not detach these handlers, they will remain attached to the event and continue to consume memory.
The following code example displays two forms and exits the application when both forms are closed. When the application starts and exits, the position of each form is remembered. This example demonstrates using the event to know when the form positions should be persisted to the file, and when the FileStream should be closed.
The class MyApplicationContext inherits from ApplicationContext and keeps track of when each form is closed, and exits the current thread when they both are. The class remembers the position of each form when it is closed. When the event occurs, the class writes the positions of each for the user to the file. The form position data is stored in a file titled appdata.txt that is created in the location determined by UserAppDataPath. The Main method calls Application.Run(context) to start the application given the ApplicationContext.