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This is a weird problem. I have created Web User Control with two TextBoxes and two CustomValidators (server-side only). I have also implemented IValidator interface and created ValidationGroup property that deafults to null.
The problem is that when I put this control on a website it doesn’t block events when it’s not valid. I’ve set CausesValidation on a Button that just reads proerty of my Web User Control and writes it to Label.
Any ideas why Button OnCLick event fires ALWAYS?
Validators don’t prevent the normal course of the asp.net lifecycle of a page. In your handler, you should check Page.IsValid and not do any of your normal processing if Page.IsValid = false