Difference Between LostFocus Event and Leave Event of TextBox

Check the notes section on these links:

• http://msdn.microsoft.com/en-us/library/system.windows.forms.control.lostfocus.aspx

• http://msdn.microsoft.com/en-us/library/system.windows.forms.control.leave.aspx

According to MSDN, there is difference when changing focus of a control. The Leave event occurs before a validation and LostFocus occurs after validation.

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UPDATE: 14 Feb 2019

I see that I'm still getting views and upvotes on the answer that I posted couple of years ago. It has now become imperative that I include a (rather important) quote from the MSDN links above to avoid confusion among new programmers (note the difference of order esp. in case of focus by using the mouse or by calling the Focus method):

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:

Enter

GotFocus

Leave              <--- before validation

Validating      --
                  |<--- validation
Validated       --

LostFocus          <--- after validation

When you change the focus by using the mouse or by calling the Focus method, focus events occur in the following order:

Enter

GotFocus

LostFocus          <--- before validation

Leave              <--- before validation

Validating      --
                  |<--- validation
Validated       --

^{N.B: Emphasis on text and indicators in the quote added by me}

They happen at different points in the control's lifecycle. Depending on the method used, validation happens after Leave and before LostFocus.

See MSDN: http://msdn.microsoft.com/en-us/library/system.windows.forms.control.lostfocus.aspx

Leave() event means that first executes keyboard event and then executes mouse event where as Lost() event means that first executes mouse event and then executes keyboard event.