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ASP.NET validation controls are: RequiredFieldValidator: This validates controls if controls contain data. CompareValidator: This allows checking if data of one control match with other control. RangeValidator: This verifies if entered data is between two values. RegularExpressionValidator: This checks if entered data matches a specific format. CustomValidator: Validate the data entered using a client-side script or a server-side code. ValidationSummary: This allows developer to display errors in one place.