Validation Patterns in ASP.NET Core

Rationale

Validation is critical for both security and user experience. Poor validation leads to invalid data, security vulnerabilities, and confusing error messages. These patterns provide a comprehensive approach to validation at multiple layers.

Validation Strategy

Layer	Purpose	Technology
Client-Side	Immediate feedback, reduce server load	jQuery Validation, HTML5
Model Binding	Data type/format validation	Model Binders
Application	Business rule validation	FluentValidation, DataAnnotations
Configuration	Startup validation	IValidateOptions
Database	Constraint enforcement	EF Core Configurations

Validation Approach Decision Tree

Choose the validation approach based on complexity:

validation-patterns

Validation Patterns in ASP.NET Core

Rationale

Validation Strategy

Validation Approach Decision Tree