How does ASP.NET handle forms validation on both client and server sides?

How does ASP.NET handle forms validation on both client and server sides?

ASP.NET uses a combination of client-side and server-side validation to ensure data integrity. Client-side validation provides immediate feedback to users, while server-side validation acts as a final check before processing the data.

What are some common validation techniques used in ASP.NET?

Common techniques include using data annotations, custom validation attributes, and validation controls like RequiredFieldValidator and RegularExpressionValidator.

Can you explain how data annotations work?

Data annotations are attributes you can apply to model properties to specify validation rules. For example, [Required] ensures a field is not empty, while [StringLength] limits the length of input.

Is client-side validation enough, or do I need server-side validation too?

Client-side validation enhances user experience but can be bypassed. Always implement server-side validation to ensure data integrity and security.