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title: Validation Rules and Standard Controllers
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# Validation Rules and Standard Controllers

If a user enters data on a Visualforce page that uses a standard controller, and that data causes a validation rule error, the error can be displayed on the Visualforce page. If the validation rule error location is a field associated with an `<apex:inputField>` component, the error displays there. If the validation rule error location is set to the top of the page, use the `<apex:pageMessages>` or `<apex:messages>` component within the `<apex:page>` to display the error.