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You need to set the Data Source, Data Member and Container Control properties of the Error Provider control to set the error for a databound control.
Instead, it will display a message that is generated by the web browser itself.
Client-side validation alone does not ensure security; therefore data needs to be validated on the server-side as well.
Forms frequently include required input that needs to be clearly identified using labels.
Most current web browsers support these features and handle input validation.
Also, HTML5 validation helps users inputting data by providing specific controls, such as date pickers and custom on-screen keyboards.