Annotations

Data Annotations and Validation

How to use Data Annotation attributes to declaratively validate model properties, and how MVC surfaces those rules on both server and client.

Data Annotations vs Fluent API

Compare EF Core's two configuration approaches - inline Data Annotations and the more powerful Fluent API - and learn when each is the right tool.

Data Annotations Validation

Use System.ComponentModel.DataAnnotations attributes with DataAnnotationsValidator and ValidationSummary or ValidationMessage to validate Blazor forms.

Selenium with TestNG

Learn how TestNG's annotations, grouping, and reporting turn raw Selenium WebDriver scripts into a structured, parallelizable, CI-ready test suite.

Groovy and Annotations

Understand how Groovy's AST transformation annotations like @Canonical, @Immutable, and @CompileStatic generate real code at compile time, and how to build you…

Spring Beans and Annotations

Understand what a Spring bean is, how stereotype annotations declare them, and how lifecycle and qualifier annotations control their behavior.

Type Annotations in TypeScript

How to explicitly declare the type of a variable, parameter, or return value using TypeScript's colon syntax.

Nullable Reference Types

See how C# 8's nullable reference types add compile-time null-safety annotations on top of the runtime's existing nullable value type system.