Answer
Validation runs after binding and populates ModelState with errors. Action logic executes only after validation passes. Supports Data Annotations, custom validators, and IValidatableObject.
Quick Answer
Data annotations validate model properties after binding. [Required] prevents nulls/empties; [StringLength] limits character count; [Range] checks numeric bounds. ModelState.IsValid tells you if all passed. Return 400 with ModelState if invalid. For complex rules spanning multiple fields, implement IValidatableObject.Validate() on the model class.
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ