仅当接收焦点的控件的CausesValidation属性设置为true时，才会引发Validating事件.例如，如果您已在TextBox1的Validating事件中编写了代码，然后单击OK按钮(CausesValidation = true)，则会引发Validating事件，但是，如果您单击Cancel按钮(CausesValidation = false)，则会出现不会引发Validating事件.

The Validating event is raised only when the control that receives the focus has the CausesValidation property set to true. For example, if you have written code in TextBox1''s Validating event, and you click the OK button (CausesValidation = true) then the Validating event is raised, but if you click the Cancel button (CausesValidation = false) then the Validating event is not raised.

您可以causesValidation和validationgroup属性.