Blog

Mert Özen's blog posts on software development, backend, frontend, and DevOps.

Series

.NET Core Web API 36 Angular 31 JavaScript Basics 19 JavaScript Intermediate 18 JavaScript Advanced 16 TypeScript Basics 14 TypeScript Intermediate 14 TypeScript Advanced 12 Entity Framework Core 28 Dapper 16 Git & GitHub 29 Web Security (OWASP Top 10) 21 LLM Fundamentals 20 C# Fundamentals 20 Object-Oriented Programming in C# 16 C# Collections and Generics 11 LINQ 17 Asynchronous Programming in C# 17 Advanced C# 14 C# Versions 6

4 posts found #validation

Newest Oldest Popular

Backend PART 36

What's New in .NET 10: AddValidation, OpenAPI 3.1 and Server-Sent Events in ASP.NET Core

.NET 10 LTS brings AddValidation to minimal APIs, OpenAPI 3.1 and YAML, TypedResults.ServerSentEvents, System.Text.Json-based JSON Patch, dotnet run app.cs, C# 14 and breaking changes such as cookie auth 401/403.

4 Nov 2026 9 min 41

Backend PART 09

Model Validation in ASP.NET Core: Data Annotations and FluentValidation

Model validation with Data Annotations, ModelState and the automatic 400, customizing ValidationProblemDetails, custom attributes, IValidatableObject and FluentValidation 11.x, including culture pitfalls with Range and messages.

4 Nov 2026 8 min 33

Frontend PART 16

Angular Reactive Forms: FormGroup, FormBuilder, FormArray and Validators

Reactive forms in Angular 12: building the form in the class with FormControl, FormGroup and FormBuilder, custom and async validators, dynamic fields with FormArray, valueChanges and patchValue.

31 Oct 2026 8 min 57

Frontend PART 15

Angular Template-driven Forms: ngModel, ngForm and Form Validation

We build a template-driven form in Angular 12: FormsModule, ngModel and name, ngForm with ngSubmit, required/email/pattern validators, touched/dirty states, CSS classes and ngModelGroup.

31 Oct 2026 7 min 81