ASP.NET Custom Validator Error Message: Control referenced by the property cannot be validated

Question

I use ASP.NET and have a Button and a CustomValidator, which has to validate the button.

Answer 1

You can only use a CustomValidator against Input controls that accept user input:

Client-side validation enhances the validation process by checking user input before it is sent to the server.

What you want to do is look here at Button Controls and Validation.