Form.OnClosing Method (CancelEventArgs)
Raises the Closing event.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
abstract OnClosing : e:CancelEventArgs -> unit override OnClosing : e:CancelEventArgs -> unit
Parameters
- e
-
Type:
System.ComponentModel.CancelEventArgs
A CancelEventArgs that contains the event data.
Caution |
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The OnClosing method is obsolete in the .NET Framework version 2.0; use the OnFormClosing method instead. |
Raising an event invokes the event handler through a delegate. For more information, see Handling and Raising Events.
The OnClosing method also allows derived classes to handle the event without attaching a delegate. Overriding this method is the preferred technique for handling the event in a derived class.
Caution |
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The OnClosed and OnClosing methods are not called when the Application.Exit method is called to exit your application. If you have validation code in either of these methods that must be executed, you should call the Form.Close method for each open form individually before calling the Exit method. |
Notes to Inheritors:
When overriding OnClosing in a derived class, be sure to call the base class's OnClosing method so that registered delegates receive the event.
Available since 1.1
