Forem: Cosmin Irimescu

I Deployed a .NET App Without DevOps Headaches — Here's How

Cosmin Irimescu — Thu, 31 Jul 2025 21:53:42 +0000

A few weeks ago, I started playing with Blazor — just a small side project to explore the framework.

When the app started to look decent (thanks to MudBlazor), I figured:
“Why not put it online?”

That's when I remembered how much I miss the old days of FTP and hitting Refresh.

I didn’t want to set up Docker, Kubernetes, or a full CI/CD pipeline to deploy a simple .NET app.
So I started looking for something lightweight — and that’s when I discovered Fly.io.

It took just a few commands to go from dotnet run to a live URL. No configs, no cloud dashboards, no DevOps drama.

Curious?

I wrote a whole post about the process (and how surprisingly smooth it was) — including:

How to deploy a Blazor or .NET app to Fly.io
What files get generated automatically
Why I think we overcomplicate things sometimes
And how to go from zero to online in 5 minutes

👉 Read the full article here:
Hosting .NET Apps Without DevOps Drama

Real-Time Cross-Tab Notifications with SignalR in ASP.NET Core

Cosmin Irimescu — Sat, 26 Oct 2024 15:31:33 +0000

Hey dev community! 👋

I've just published a sample repository demonstrating how to implement real-time notifications with SignalR in ASP.NET Core. I built this while exploring cross-tab communication possibilities, and I thought it might be useful for others too.

What's Inside?

The repository contains a clean implementation showing how to:

Set up SignalR in ASP.NET Core
Handle real-time notifications across multiple browser tabs
Manage automatic reconnection
Implement animated notifications

Key Features

public class NotificationHub : Hub
{
    public override async Task OnConnectedAsync()
    {
        string userId = Context.User.FindFirst("uid").Value;
        await Groups.AddToGroup(Context.ConnectionId, userId);
        await base.OnConnectedAsync();
    }

    public async Task SendNotification(string message)
    {
        await Clients.All.SendAsync("ReceiveNotification", message);
    }
}

The implementation is straightforward yet powerful. It handles multiple tabs seamlessly, making it perfect for modern web applications.

Where to Find It?

📦 Repository: GitHub - SignalR.NET
📝 Detailed Tutorial (Italian): cosminirimescu.com/signalr-in-asp-net-core

While the tutorial is in Italian, the code and commit messages are in English. If you're interested in the implementation details, I've written a comprehensive guide on my blog.

Tech Stack

ASP.NET Core 8.0
SignalR
JavaScript
CSS3 for animations

Feel free to star the repo if you find it useful or raise issues if you have suggestions for improvements!

dotnet #signalr #aspnetcore #webdev #github #opensource

Building an API Gateway with YARP in .NET

Cosmin Irimescu — Sun, 25 Aug 2024 09:59:08 +0000

Hello, .NET developers! 👋

Have you ever struggled with creating an efficient API Gateway for your microservices? YARP (Yet Another Reverse Proxy) might be the solution you've been looking for!

In my latest article, I guide you through implementing an API Gateway using YARP in .NET. Here's a taste of what you'll find:

Why YARP is a solid alternative to Ocelot
How to configure YARP in a .NET project
Implementing an example microservice
Best practices for routing and request handling

Code Sample

Here's a small snippet to pique your interest:

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddReverseProxy()
    .LoadFromConfig(builder.Configuration.GetSection("ReverseProxy"));

var app = builder.Build();

app.MapReverseProxy();

app.Run();

This is just the beginning! In the full article, you'll find detailed explanations and more complex examples in Italian.

🔗 Read the full article here: https://cosminirimescu.com/api-gateway-con-yarp-in-net/

📂 The complete source code is available on GitHub: https://github.com/irimescucosmin/APIGateway.NET

Whether you're a beginner or an experienced developer, this article will provide you with valuable insights for your next microservices project.

Feel free to leave comments or questions below. Happy reading and coding! 🚀

My Journey in Building a Personal Website

Cosmin Irimescu — Fri, 26 Jul 2024 19:16:55 +0000

Hey there, fellow devs! 👋 Cosmin here. I recently embarked on the adventure of creating my own website, and boy, was it a ride! I thought I'd share my experience with you all - maybe it'll save some of you a headache or two.

The Developer's Dilemma

Like many of you, I started with the classic developer's hubris: "I can build this from scratch!" 💪 My first attempt? A full-blown Laravel and Vue.js setup. Fast forward a year, and I had a complex codebase, endless tweaks, and a stark realization: I was spending more time wrestling with code than actually sharing knowledge. Oops.

The Plot Twist: Embracing WordPress

After a few more attempts (including a custom WordPress theme that ate up way too much time), I finally saw the light: WordPress with a pre-built ThemeForest theme.

Why did this work so well?

Quick setup (hello, more time for actual content!)
Professional look out of the box
Less time debugging, more time writing
SEO stuff mostly handled (phew!)
Easy to customize without diving into the deep end

What I Learned

Don't reinvent the wheel (unless that's your actual goal)
Focus on why you're building the site, not how
Sometimes, the simplest solution is the best one (took me a while to accept this)

What's Next?

Crafting a killer newsletter
Building a community (come join us!)
Becoming a go-to resource in our field

Check Out My Site and Share Your Story!

I'd love for you to take a peek at my new online home: cosminirimescu.com. Click around, explore, and let me know what you think! Your feedback is gold.

And hey, while you're at it, why not share your own website-building journey in the comments below? I bet we could all learn a thing or two from each other's triumphs and face-palm moments. 😄

Remember, folks: don't wait for perfect. Start, stumble, learn, repeat. That's the real dev lifecycle!

[Italian] Trasforma le Eccezioni da Incubo a Opportunità con IExceptionHandler in ASP.NET Core!

Cosmin Irimescu — Thu, 11 Jul 2024 19:47:09 +0000

Quante volte ti sei sentito come gli astronauti dell'Apollo 13 mentre affrontavi eccezioni non gestite nella tua applicazione ASP.NET Core? 🚀
Le eccezioni non gestite possono mandare in tilt i nostri sistemi, generare risposte di errore criptiche e rendere i log incomprensibili. Ma non temere, ASP.NET Core ci fornisce uno strumento potente per gestire queste situazioni: IExceptionHandler!

Perché IExceptionHandler?

IExceptionHandler ci consente di centralizzare la gestione delle eccezioni e fornire risposte coerenti e informative. Ecco alcuni vantaggi:

📝 Risposte di errore strutturate e facili da comprendere per gli utenti.
🔍 Logging centralizzato delle eccezioni per semplificare il debug.
🎨 Possibilità di personalizzare la gestione in base al tipo di eccezione.
✨ Mantenimento di un codice più pulito e leggibile separando la logica di gestione delle eccezioni.

Progetto di Esempio

Per gli sviluppatori impazienti di buttarsi nel codice, ho creato un progetto di esempio completo disponibile su GitHub: ExceptionsHandler.NET

Sentitevi liberi di esplorare il codice, provarlo e usarlo come punto di partenza per le vostre implementazioni!

Vuoi Saperne di Più?

Se vuoi approfondire come IExceptionHandler può rivoluzionare il tuo approccio alla gestione delle eccezioni in ASP.NET Core, ti invito a visitare il mio sito web Cosmin Irimescu.

Troverai articoli dettagliati, tutorial e risorse che ti guideranno attraverso l'implementazione di IExceptionHandler e molte altre best practice per lo sviluppo di software pulito e resiliente.
E se hai domande, suggerimenti o vuoi semplicemente connetterti, non esitare a raggiungermi! Sono sempre entusiasta di interagire con altri sviluppatori e di imparare dalle loro esperienze.
Allora, sei pronto a portare la tua gestione delle eccezioni in ASP.NET Core al livello successivo? 🚀

dotnet #aspnetcore #csharp #exceptionhandling #cleancode