Events

The following table lists useful events implemented by the Control class. All controls that inherit from this class inherit these properties unless they override the Control class’ behavior.

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Event	Purpose
AutoSizeChanged	Occurs when the control’s AutoSize property changes.
BackColorChanged	Occurs when the control’s BackColor property changes.
BackgroundImageChanged	Occurs when the control’s BackgroundImage property changes.
BackgroundImageLayoutChanged	Occurs when the control’s BackgroundImageLayout property changes.
Click	Occurs when the user clicks the control. This event is at a higher logical level than the MouseClick event, and it can be triggered by other actions than a mouse click (such as pressing the Enter key or a shortcut key).
ContextMenuChanged	Occurs when the control’s ContextMenu property changes.
ContextMenuStripChanged	Occurs when the control’s ContextMenuStrip property changes.
ControlAdded	Occurs when a new control is added to the control’s contained child controls.
ControlRemoved	Occurs when a control is removed from the control’s contained child controls.
CursorChanged	Occurs when the control’s Cursor property changes.
DockChanged	Occurs when the control’s Dock property changes.
DoubleClick	Occurs when the user double-clicks the control.
DragDrop	Occurs when the user drops something on the control in a drag-and-drop operation. This event handler should process the dropped information appropriately.
DragEnter	Occurs when the user drags something over the control in a drag-and-drop operation.
DragLeave	Occurs when the user drags something off of the control in a drag-and-drop operation.
DragOver	Occurs when the user has dragged something over the control in a drag-and-drop operation. This event fires repeatedly until the user drags off of the control, drops on the control, or cancels the drop.
EnabledChanged	Occurs when the control’s Enabled property changes.
Enter	Occurs when the control is entered. This event fires before the GotFocus event.
FontChanged	Occurs when the control’s Font property changes.
ForeColorChanged	Occurs when the control’s ForeColor property changes.
GiveFeedback	Occurs during a drag-and-drop operation to let the drag source control take action.
GotFocus	Occurs when the control receives the input focus. This event fires after the Enter event. Generally, the Enter event is preferred.
HelpRequested	Occurs when the user requests help for the control. For example, if the user moves the focus to a TextBox and presses F1, the TextBox raises this event.
Invalidated KeyDown	Occurs when part of the control is invalidated. Occurs when the user presses a key while the control has the input focus.
KeyPress	Occurs when the user presses and releases a key while the control has the input focus.
KeyUp	Occurs when the user releases a key while the control has the input focus.
Layout	Occurs when the control should arrange its child controls. This event occurs before the Resize and SizeChanged events and is preferred for arranging child controls.
Leave	Occurs when the input focus leaves the control. This event fires before the LostFocus event.
LocationChanged	Occurs when the control’s Location property changes. This event fires after the Move event fires.
LostFocus	Occurs when the input focus leaves the control. This event fires after the Leave event. Generally, the Leave event is preferred.
MarginChanged	Occurs when the control’s Margin property changes.
MouseCaptureChanged	Occurs when the control loses a mouse capture.
MouseClick	Occurs when the user clicks the mouse on the control.
MouseDoubleClick	Occurs when the user double-clicks the mouse on the control.
MouseDown	Occurs when the user presses a mouse button down over the control.
MouseEnter	Occurs when the mouse enters the control.
MouseHover	Occurs when the mouse hovers over the control.
MouseLeave	Occurs when the mouse leaves the control.
MouseMove	Occurs when the mouse moves over the control.
MouseUp	Occurs when the user releases a mouse button over the control.
MouseWheel	Occurs when the user moves the mouse wheel while the control has the input focus.
Move	Occurs when the control is moved. This event fires before the LocationChanged event fires.
PaddingChanged	Occurs when the control’s Padding property changes.
Paint	Occurs when the control must redraw itself. Normally the program draws on the control during this event (if it draws on the control at all).
ParentChanged	Occurs when the control’s Parent property changes.
QueryContinueDrag	Occurs when something changes during a drag-and-drop operation so that the drag source can decide whether to modify or cancel the drag.
RegionChanged	Occurs when the control’s Region property changes.
Resize	Occurs while the control is resizing. This event occurs after the Layout event, but before the SizeChanged event.
SizeChanged	Occurs while the control is resizing. This event occurs after the Layout and Move events.
SystemColorsChanged	Occurs when the system colors change. For instance, you might want to draw something using the same color that the operating system uses for active forms. If the user changes the system’s color for borders, you can use this event to update your application.
TabIndexChanged	Occurs when the control’s TabIndex property changes.
TabStopChanged	Occurs when the control’s TabStop property changes.
TextChanged	Occurs when the control’s Text property changes.
Validated	Occurs when the control has successfully finished validating its data.
Validating	Occurs when the control should validate its data.
VisibleChanged	Occurs when the control’s Visible property changes.