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There are the following two types of validation in ASP.NET:
Client-Side Validation
Server-Side Validation
Client-Side Validation:
When validation is done on the client browser, then it is known as Client-Side Validation. We use JavaScript to do the Client-Side Validation.
Server-Side Validation:
When validation occurs on the server, then it is known as Server-Side Validation. Server-Side Validation is a secure form of validation. The main advantage of Server-Side Validation is if the user somehow bypasses the Client-Side Validation, we can still catch the problem on server-side.
The following are the Validation Controls in ASP.NET:
RequiredFieldValidator Control
CompareValidator Control
RangeValidator Control
RegularExpressionValidator Control
CustomFieldValidator Control
ValidationSummary