Validation controls in ASP.NET C#

ASP.NET provides a range of validation controls:-

1. RequiredFieldValidator validates compulsory/required input.
2. RangeValidator validates the range. Validates that input falls between the given range values.
3. CompareValidator validates or compares the input of a control with another control value or with a fixed value.
4. RegularExpressionValidator validates input value against a defined regular expression pattern.
5. CustomValidator allows to customize the validation logic with respect to our application logic.
6. ValidationSummary displays all errors on page collectively.