Blog

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

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.NET Core Web API 36 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

2 posts found #validation

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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 43

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 34