Validation Controls

in ASP.NET are a set of server-side controls that help validate user input on web forms. These controls ensure that the data entered by the user meets criteria or constraints before it is processed further. They a convenient way to perform validation without writing custom code.

Types of Validation Controls:

There are types of validation controls available in ASP.NET, including:

1. RequiredFieldValidator: This ensures that a user enters a value in a specific field. It displays an error message if the field is left empty.




2. RangeValidator: This control validates that a value falls within a specified range. It can be used for numeric, date, or values.




3. RegularExpressionValidator: This control validates that a value matches a specified regular expression . It is commonly used for validating email addresses, phone numbers, or other complex .




4. CompareValidator: This control compares the value entered in one control with the value entered in another control. It is useful for passwords or validating that two fields have the same value.





Summary:

Validation Controls in ASP.NET provide an easy way to validate user input on web forms. They help ensure that the data entered by the user meets specific criteria or constraints. By using these controls, developers can perform validation without writing custom code, saving time and effort.

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