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What is required field validation?
ASP.NET RequiredFieldValidator Control
This validator is used to make an input control required. It will throw an error if user leaves input control empty. It is used to mandate form control required and restrict the user to provide data.
What is field validation?
Field validation is an automated process of ascertaining that each field contains the correct value before the form is accepted. The concept is straightforward. Does the phone number field contain a phone number?
