Hi,
There are many controls available in ASP.net.The one of the most important control is validation control.Validator controls are used to validate input on any web forms pages.More than one control can be used on a given input field.There are also specific types of validation such as range checking and
pattern matching.RequiredFieldValidator, CompareValidator,
RangeValidator, RegularExpressionValidator, CustomValidator,
ValidationSummary are the types of validation control.To develop a
website these controls are necessary.