Occurs when the form is closing.
Syntax
[System.ComponentModel.Browsable(false)]
public event System.ComponentModel.CancelEventHandler Closing
Remarks
The Form.Closing event is obsolete in the .NET Framework version 2.0; use the Form.FormClosing event instead.
The Form.Closing event occurs as the form is being closed. When a form is closed, all resources created within the object are released and the form is disposed. If you cancel this event, the form remains opened. To cancel the closure of a form, set the System.ComponentModel.CancelEventArgs.Cancel property of the System.ComponentModel.CancelEventArgs passed to your event handler to true.
When a form is displayed as a modal dialog box, clicking the Close button (the button with an X at the upper-right corner of the form) causes the form to be hidden and the Form.DialogResult property to be set to DialogResult.Cancel. You can override the value assigned to the Form.DialogResult property when the user clicks the Close button by setting the Form.DialogResult property in an event handler for the Form.Closing event of the form.
When the Form.Close method is called on a System.Windows.Forms.Form displayed as a modeless window, you cannot call the Control.Show method to make the form visible, because the form's resources have already been released. To hide a form and then make it visible, use the Control.Hide method.
The Form.Closed and Form.Closing events are not raised when the Application.Exit method is called to exit your application. If you have validation code in either of these events that must be executed, you should call the Form.Close method for each open form individually before calling the Application.Exit method.
If the form is an MDI parent form, the Form.Closing events of all MDI child forms are raised before the MDI parent form's Form.Closing event is raised. In addition, the Form.Closed events of all MDI child forms are raised before the Form.Closed event of the MDI parent form is raised. Canceling the Form.Closing event of an MDI child form does not prevent the Form.Closing event of the MDI parent form from being raised. However, canceling the event will set to true the System.ComponentModel.CancelEventArgs.Cancel property of the System.ComponentModel.CancelEventArgs that is passed as a parameter to the parent form. To force all MDI parent and child forms to close, set the System.ComponentModel.CancelEventArgs.Cancel property to false in the MDI parent form.
For more information about handling events, see [<topic://cpconEventsOverview>].
Requirements
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0