Initialize
Event
The
Initialize event fires when an instance of the form is created in your
application. Initialize fires just before Load the very first time the form is
loaded into memory during the application's current session.
Load
Event
The
Load event fires when the form loads into memory. If
the form is loaded, unloaded, and re-loaded into memory several times in the
application, then the form's Load event will fire at each load. This
event's procedure is the customary place for programmers to insert code that
sets form-level Private variables (not associated with custom properties) and
performs other startup processes.
Activate
event
The
Activate event fires most often (at least on a multi-form application) because
the user can navigate back and forth between forms many times after the forms
are loaded in memory and visible.
DeActivate,
Unload, QueryUnload, and Terminate Events
These
events fire toward the end of a form's life. Their event procedures are
therefore good places to put "cleanup" code. Once again, the exact
circumstances and timing of these events can differ.
DeActivate
Event
The
DeActivate event fires when a form or a control on the form loses focus to
another object in the application outside the form. The DeActivate event does
not fire when the user navigates to a completely different application, but
only when the user navigates elsewhere in the current application. The
DeActivate event does not fire when the application closes or when the current
form unloads.
QueryUnload
Event
The
QueryUnload event fires just before a form unloads from memory. The QueryUnload
event fires just before the Unload event. Its main purpose is to let you detect
why the form is being unloaded and to programmatically halt unloading if necessary.
Unload
Event
The
Unload event procedure is where programmers usually put cleanup code. The Unload
event fires after the QueryUnload event. It is possible to stop the form from
unloading in the Unload event procedure by setting Cancel to True.
Terminate
Event
The
Terminate event happens when the instance of the form has been completely unloaded
and all the form's variables have been set to Nothing. The Terminate event happens
only when you explicitly set the form to Nothing in your code during or after the
Unload event procedure.
