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.