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As an alternative you can also try our non-DTD-based validator.
The receipt for an application or in-app purchase is a record of the sale of the application and of any in-app purchases made from within the application.
If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, Mobile OK content, or to find broken links, there are other validators and tools available.
though: The Error Provider component does not provide built-in support for accessibility clients.
To make your application accessible when using this component, you must provide an additional, accessible feedback mechanism.
The following code example uses the derived class Text Box and validates an e-mail address that the user enters.
If the e-mail address is not in the standard format (containing "@" and "."), the validation fails, an Error Provider icon is displayed, and the event is canceled.