The EU VAT Box is a single ASP.NET server control that is perfect for e-commerce websites and web applications. With client-side syntax checks and server side validation against the VIES VAT number database of the European Commission. Features * Live check against official EU database to validate VAT ID * Client and Server-Side syntax validation * Get registered company name and address data for VAT ID (in some countries) (demo) * Automatically generates client and server-side ASP.NET validation * Easy integration in existing implementation by using events * Extendability for advanced developers * Can be hooked to other controls for country and prefix selection