Assembly: System.Windows.Forms (in system.windows.forms.dll)
When you change the focus by using the keyboard (TAB, SHIFT+TAB, and so on), by calling the Select or SelectNextControl methods, or by setting the ContainerControl.ActiveControl property to the current form, focus events occur in the following order:
When you change the focus by using the mouse or by calling the Focus method, focus events occur in the following order:
If the CausesValidation property is set to false, the Validating and Validated events are suppressed.
Note The GotFocus and LostFocus events are low-level focus events that are tied to the WM_KILLFOCUS and WM_SETFOCUS Windows messages. Typically, the GotFocus and LostFocus events are only used when updating UICues or when writing custom controls. Instead the Enter and Leave events should be used for all controls except the Form class, which uses the Activated and Deactivate events. For more information about the GotFocus and LostFocus events, see the WM_SETFOCUS and WM_KILLFOCUS topics in the "Keyboard Input Reference" section of the Platform SDK Documentation in the MSDN library at http://msdn.microsoft.com/library.
Do not attempt to set focus from within the LostFocus event handler. Doing so can cause your application or the operating system to stop responding. For more information about the LostFocus event, see the WM_KILLFOCUS topic in "Keyboard Input Reference" section, and the Message Deadlocks topic in the "Messages and Message Queues" section of the Platform SDK Documentation in the MSDN library at http://msdn.microsoft.com/library.
For more information about handling events, see Consuming Events.
Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.