ExpressiveAnnotations is a small .NET and JavaScript library which provides full-stack, annotation-based, conditional validation mechanisms. Given attributes, powered by expressions engine, allow to forget about imperative way of step-by-step verification of validation conditions in many cases. Since fields validation requirements are applied as metadata, domain-related code is more condensed. This package contains 3 components: - ExpressiveAnnotations.dll - assembly with validation attributes powered by expressions engine, - ExpressiveAnnotations.MvcUnobtrusive.dll - assembly with model validators for ASP.NET MVC, - expressive.annotations.validate.js - unobtrusive validation script.