Custom routing constraint in AspNet core

Introduction URL routing is a fundamental part of ASP.NET Core applications, determining how incoming requests are mapped to controller actions. While the framework provides numerous built-in route constraints like int, bool, and guid, there are situations where you need more sophisticated validation rules for your URL parameters. This is where custom route constraints become invaluable. In this guide, we’ll explore how to create and implement custom route constraints in ASP.NET Core using the IRouteConstraint interface. By the end, you’ll understand how to validate URL parameters with complex business rules specific to your application. ...

June 20, 2025 · 7 min · 1303 words

Data Annotations in C#: The Complete Guide

Taming Your Data with C# Annotations Have you ever found yourself writing the same validation code over and over? You know the drill, checking if a field is required, validating email formats, confirming passwords match… it gets repetitive fast. That’s where data annotations come to the rescue! Think of data annotations as sticky notes you attach to your C# properties. These little attributes tell frameworks like ASP.NET Core and Entity Framework how to treat your data without you writing tons of validation logic. ...

June 20, 2025 · 9 min · 1859 words

Routing in ASP.NET Core: A Comprehensive Guide

Introduction to ASP.NET Core Routing At its core, routing in ASP.NET Core is just about connecting HTTP requests to the right code in your application. Good routing gives you clean, readable URLs that make sense to both users and search engines. Since ASP.NET Core 3.0, we’ve been using something called Endpoint Routing, which has gotten better with each new version. It works the same way across all parts of your app, whether you’re using MVC controllers, Razor Pages, or the newer minimal APIs. ...

June 20, 2025 · 8 min · 1680 words