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On my FormView I have 4 attributes. User has to provide at least one of them. Is there any way to validate it with built-in ASP.NET Validators, or do I have to subscribe to ItemUpdating/ItemInserting events of FormView, then then validate is manually?
There is no built-in validator for such validation. If you want to stick to framework validation control behavior you can place a CustomValidator on your web form and implement client and server validation routines.