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Following are the validation types in ASP.NET: • The RequiredFieldValidator control forces the input control a required field. • The CompareValidator control is used to compare values of the two input fields. • The CustomValidator control allows you to write a method to handle the validation of the value entered. • The RangeValidator control is used to check that the user enters an input value that falls between two values. It is possible to check ranges within numbers, dates, and characters. • The RegularExpressionValidator control ensures an input value matches a specified pattern. • The ValidationSummary control is used to display a summary of all validation errors occurred in a Web page.