Adrian Bailador | .NET

HybridCache in .NET 9: One Caching API, Stampede Protection Included

Tue, 02 Jun 2026 00:00:00 GMT

IMemoryCache is fast but per-server. IDistributedCache is shared but slow and full of boilerplate. .NET 9's HybridCache combines both into one API — two-tier caching, built-in stampede protection and tag invalidation. Here's how to use it properly.

Uber-like System in .NET: Driver Matching, Surge Pricing and the Complete Request Flow

Mon, 25 May 2026 00:00:00 GMT

We've built the location pipeline and the trip state machine. Now we connect them: find the nearest available driver, calculate surge pricing, and trace the full lifecycle from rider request to completed trip.

State Machines in .NET: Modelling Uber's Trip Lifecycle with EF Core

Sun, 17 May 2026 00:00:00 GMT

A trip isn't just data — it's a lifecycle. Requested, assigned, en route, completed, cancelled. Get the transitions wrong and two drivers accept the same ride, or a payment fires twice. Here's how to model it correctly in .NET.

Real-time Driver Location Tracking in .NET: Redis GEO, State Buffer and SignalR

Mon, 11 May 2026 00:00:00 GMT

Uber processes millions of GPS updates every second. Here's how to build the same real-time location tracking pipeline in .NET — from driver updates to rider map — using Redis GEO, a mutable state buffer and SignalR.

CQRS Without MediatR: Hand-Rolled Command and Query Handlers in .NET

Mon, 04 May 2026 00:00:00 GMT

MediatR went commercial and half the .NET world started looking for an exit. The good news: CQRS was never about MediatR. Here's how to build clean, testable command and query handlers using nothing but the built-in DI container.

Anti-Corruption Layer in .NET: Protecting Your Domain from External APIs

Sun, 26 Apr 2026 00:00:00 GMT

Every external API you consume is a ticking bomb. A model change, a renamed field, a deprecated endpoint — and suddenly your domain logic is full of someone else's concepts. Here's how the Anti-Corruption Layer pattern keeps your domain clean.

Kubernetes Probes + .NET: Liveness, Readiness and Startup in Production

Wed, 22 Apr 2026 00:00:00 GMT

One /health endpoint is not enough for Kubernetes. Learn how to configure Liveness, Readiness, and Startup probes correctly in .NET — with tagged Health Checks, production YAML, common mistakes, and the reasoning behind every parameter.

Health Checks in ASP.NET Core: Beyond the Basic /health Endpoint

Sun, 12 Apr 2026 00:00:00 GMT

Most developers add a /health endpoint and call it done. Here's how to build health checks that actually tell you what's wrong — database, external APIs, disk space, and Kubernetes probes, all in production-ready code.

IAsyncEnumerable in C#: Streaming Data Without Loading Everything into Memory

Sun, 05 Apr 2026 00:00:00 GMT

Master IAsyncEnumerable to handle large datasets efficiently. Learn production patterns with Entity Framework, HttpClient streaming, and real performance comparisons.

How I Fixed Supabase Rate Limiting in Production

Sat, 28 Mar 2026 00:00:00 GMT

Direct Supabase calls from the frontend in The Coffee Timer were triggering 429 errors under load. Here's how moving critical operations to a .NET backend, using Supabase RPCs, server-side caching, and a localStorage TTL fixed it for good.

What Your .NET Exceptions Are Telling Attackers (And How to Stop It)

Fri, 20 Mar 2026 00:00:00 GMT

Unhandled exceptions in .NET APIs expose stack traces, database schemas, and internal paths to anyone watching. Learn how to implement secure error handling in ASP.NET Core to protect your application without sacrificing observability.

GitHub Actions for .NET: Build, Test, and Deploy Your API

Sun, 15 Mar 2026 00:00:00 GMT

Learn how to set up a complete CI/CD pipeline for your .NET applications using GitHub Actions — from building and testing on every push to deploying Docker containers to Azure

Messaging in .NET: Queues, Topics, and Why You Need Them

Sat, 07 Mar 2026 00:00:00 GMT

Learn why asynchronous messaging matters in .NET applications, how queues and topics differ, and when to use RabbitMQ, Azure Service Bus, or AWS SQS to build reliable, decoupled systems

Getting Started with PostgreSQL in .NET: From Zero to Production

Sun, 22 Feb 2026 00:00:00 GMT

Learn how to connect PostgreSQL to your .NET application using Entity Framework Core and Dapper, set up Docker locally, run migrations, and leverage PostgreSQL-specific features like JSONB, arrays, and enum types

Vertical Slice Architecture in .NET

Fri, 13 Feb 2026 00:00:00 GMT

Learn how Vertical Slice Architecture organizes code by features instead of layers, reducing coupling and accelerating development in .NET applications

Bulk Operations in EF Core 10: Beyond SaveChanges()

Wed, 04 Feb 2026 00:00:00 GMT

ExecuteUpdate and ExecuteDelete provide 300-500x performance improvements for bulk operations, eliminating the need to load thousands of entities into memory

LeftJoin and RightJoin in EF Core 10

Sun, 25 Jan 2026 00:00:00 GMT

EF Core 10 finally introduces native LeftJoin and RightJoin LINQ operators, replacing the verbose GroupJoin + DefaultIfEmpty pattern with clean, readable code

Result Pattern in C#

Sun, 18 Jan 2026 00:00:00 GMT

Learn how to implement the Result Pattern for cleaner error handling without exceptions. Discover when to use it, how to build it from scratch, and integrate it with ASP.NET Core Minimal APIs.

Minimal API Validation in .NET 10

Mon, 12 Jan 2026 00:00:00 GMT

Discover the new built-in validation support for Minimal APIs in .NET 10. Learn how to use DataAnnotations, custom validation attributes, and IValidatableObject without external packages.

Channels in C#

Sun, 04 Jan 2026 00:00:00 GMT

Learn how to build high-performance, thread-safe producer-consumer applications using System.Threading.Channels. Explore bounded and unbounded channels, backpressure strategies, and real-world implementation patterns.

Building AI-Ready Applications with Model Context Protocol in C#

Mon, 22 Dec 2025 00:00:00 GMT

Learn how to build MCP servers and clients in C# using the official SDK, and connect your .NET applications with AI models in a standard, scalable way.

The New Field Keyword Improves Properties in C# 14

Wed, 17 Dec 2025 00:00:00 GMT

Discover how the new field keyword in C# 14 eliminates boilerplate code and provides an elegant middle ground between auto-properties and full properties. Learn practical use cases including validation, lazy initialisation, and INotifyPropertyChanged.

Adapter Pattern Explained with Real Examples

Sun, 07 Dec 2025 00:00:00 GMT

Learn the Adapter Pattern through practical .NET examples: payment gateways, logging systems, and legacy code integration. Understand when and how to use this essential structural design pattern.

Repository Pattern vs Direct EF Core: The Great Debate

Sat, 29 Nov 2025 00:00:00 GMT

Should you use the Repository Pattern or work directly with DbContext? Explore both approaches with practical examples, performance benchmarks, and real-world scenarios to make the right choice for your .NET projects.

Task vs ValueTask in C#

Sat, 15 Nov 2025 00:00:00 GMT

A clear and practical guide to understanding Task vs ValueTask in .NET, with benchmarks, examples, rules of thumb, and real-world recommendations.

15 Essential C# Shorthand Operators Every Developer Should Know in 2025

Mon, 27 Oct 2025 00:00:00 GMT

Master the most powerful shorthand operators in modern C# that will transform your code. From fundamentals to C# 13 features, learn how to write cleaner, more efficient code that stands out.

Build Your Local AI with C# and .NET

Sat, 18 Oct 2025 00:00:00 GMT

Learn to run artificial intelligence models completely offline with C# and .NET using llama.cpp and LLamaSharp. Control your data, avoid API costs, and build your own local assistant step by step.

7 Types of Constructors in C#

Mon, 06 Oct 2025 00:00:00 GMT

Comprehensive guide to constructors in C#. Learn the 7 essential constructor types: default, parameterised, copy, static, private, chaining, and optional parameters. Includes practical examples, use cases, and best practices for object initialisation in C#.

AutoMapper: Mastering Complex Mappings in C#

Mon, 29 Sep 2025 00:00:00 GMT

Complete guide to AutoMapper in C#. Learn advanced mapping techniques: nested mappings, custom resolvers, value converters, projection with Entity Framework, testing strategies, performance optimisation, and common pitfalls. Includes practical examples and best practices.

Types of Unit Tests in C# – Master Testing Like a Pro

Sun, 21 Sep 2025 00:00:00 GMT

Complete guide to unit testing in C#. Learn all types of tests: basic unit tests, mocks, parametrised tests, async testing, property-based testing, and best practices. Includes practical examples with xUnit, NUnit, Moq, and advanced techniques.

Rate Limiting in ASP.NET Core – Protect Your APIs Like a Pro

Sun, 24 Aug 2025 00:00:00 GMT

Learn how to implement rate limiting in ASP.NET Core to protect your APIs from abuse, DDoS attacks, and excessive usage. Includes native .NET 7+ features, custom implementations, Redis distributed scenarios, and benchmarks.

Database Indexing in .NET with EF Core – Boost Your Query Performance

Mon, 18 Aug 2025 00:00:00 GMT

Learn how to improve query performance in your .NET applications using database indexing with Entity Framework Core. Includes examples with Fluent API, Data Annotations, migrations, and a benchmark.

Semantic Search with .NET Core and AI: Build Your Smart API from Scratch

Mon, 04 Aug 2025 00:00:00 GMT

Learn how to build a smart API with .NET Core, SQLite, and OpenAI to perform semantic search using embeddings. A practical guide for beginners who want to integrate AI into real-world applications.

Applying the Mediator Pattern in ASP.NET Core with MediatR

Sun, 27 Jul 2025 00:00:00 GMT

Decouple your ASP.NET Core applications using the Mediator pattern and MediatR. This guide shows how to structure your code for maintainability, testability, and clean architecture with real-world examples and pipeline behaviours.

SQL Server as a Configuration Provider in .NET Core

Mon, 21 Jul 2025 00:00:00 GMT

Learn how to use a SQL Server database as a configuration source in ASP.NET Core. This guide covers custom providers, dynamic reload support, and best practices for secure, scalable config management.

Detecting Missing Migrations in EF Core: A Guide for .NET Developers

Sat, 12 Jul 2025 00:00:00 GMT

Avoid database drift and deployment surprises by learning how to detect and prevent missing migrations in Entity Framework Core. Includes automated checks, runtime guards, and CI-friendly scripts.

DDD in .NET: Modelling Rich and Meaningful Domains

Sat, 28 Jun 2025 00:00:00 GMT

Learn how to apply Domain-Driven Design in .NET to create expressive, maintainable, and business-focused domain models. Includes practical examples with Value Objects, Aggregates, Repositories, and tests.

How to Measure and Improve Performance in .NET

Sat, 21 Jun 2025 00:00:00 GMT

A practical guide to diagnosing and optimising .NET applications in real-world environments. Learn what to measure, which tools to use, and the best practices for making .NET applications faster, more predictable, and more resilient.

How to Store Secrets Securely in .NET: Environment Variables, AppSettings, User Secrets and More

Sat, 14 Jun 2025 00:00:00 GMT

Learn the best practices to handle secrets in .NET applications using environment variables, user secrets, configuration files, and Azure Key Vault. Keep your credentials safe and your architecture clean.

Core-Driven Architecture: Structuring Business Logic for Maintainable and Scalable .NET Applications

Sun, 08 Jun 2025 00:00:00 GMT

Explore Core-Driven Architecture to keep your business domain isolated and clean. Learn how to build maintainable, scalable, and testable .NET applications by focusing on core business logic and clear separation of concerns.

Avoiding Indexed Access in .NET: Safer and Faster Alternatives for Production Code

Wed, 04 Jun 2025 00:00:00 GMT

Accessing elements by index is fast but risky in production .NET code. Learn safer and more expressive alternatives to avoid runtime exceptions, fragile logic, and unclear intent. Includes benchmarks, real-world examples, and a diagram.

MVVM in .NET

Sun, 01 Jun 2025 00:00:00 GMT

MVVM is a powerful architectural pattern used in .NET desktop applications like WPF, MAUI, and WinUI. In this article, we break down the pattern with a practical example, a diagram, its pros and cons, and step-by-step instructions to build it in Visual Studio Code.

Store Encrypted Data in Your Database Using .NET – Secure and Efficient

Sun, 25 May 2025 00:00:00 GMT

Protecting sensitive data is a critical requirement in any modern application. Whether it’s personal information, passwords, or API keys, we must ensure that stored data isn’t left in plain text in case of a breach.

Understanding the Cost of Abstractions in .NET

Thu, 22 May 2025 00:00:00 GMT

Abstractions make our code elegant and modular — but they're not free. In this article, we explore how some common abstractions in .NET can hurt performance if used carelessly, and how to avoid the hidden costs.

Optimising ASP.NET Core APIs for Speed and Efficiency. Practical techniques to reduce latency, CPU usage, and memory allocations

Sat, 17 May 2025 00:00:00 GMT

Building a working API is one thing — building a *fast and efficient* API is another. As your application scales or handles more users, performance becomes a critical concern.

Reducing Garbage Collector (GC) Pressure in .NET: Practical Patterns and Tools

Wed, 14 May 2025 00:00:00 GMT

Learn how to reduce GC pressure in your .NET applications using structs, ArrayPool, and smart memory patterns.

How to Read a File in C#: Quick and Efficient Methods

Sun, 11 May 2025 00:00:00 GMT

Reading files is a fundamental skill in C#, and knowing the right method can improve both performance and readability. This article explores various ways to read text files, from the simplest to the most efficient, with practical code examples and guidance.

Background Tasks in C# 🧵

Fri, 09 May 2025 00:00:00 GMT

In modern applications, especially web and desktop apps, executing long-running tasks on the main thread can block user interactions or degrade performance. That’s where background tasks come in.

How to Add Multiple Languages to Your ASP.NET Core Application (Step-by-Step Localization Guide)

Wed, 07 May 2025 00:00:00 GMT

Learn how to add localization support to your ASP.NET Core application, enabling multiple languages and culture-specific features.

Create an API in .NET with MongoDB and Pagination

Sun, 27 Apr 2025 00:00:00 GMT

Learn how to build a RESTful API using .NET and MongoDB, with a focus on implementing pagination to efficiently manage large datasets.

What’s New in C# 14: More Power, Less Code

Fri, 25 Apr 2025 00:00:00 GMT

The .NET ecosystem keeps evolving, and with the release of C# 14 alongside .NET 10, developers now have a fresh set of features that make the language even more expressive, concise, and powerful. In this post, I’ll walk you through the key improvements in this new version, with clear and practical examples.

How to Secure Your .NET Applications

Sat, 19 Apr 2025 00:00:00 GMT

Security is one of the most critical aspects of modern application development. In an era where data breaches and cyber threats are increasingly common, securing your .NET applications is not optional – it’s essential. This guide covers practical strategies and tools you can apply right now to make your applications safer and more resilient.

Multithreading in C#

Tue, 15 Apr 2025 00:00:00 GMT

Multithreading in C# might sound intimidating at first, but once you get the hang of it, it becomes a superpower for writing responsive, efficient, and modern applications. Whether you're building a UI that shouldn't freeze or handling heavy background work in a backend service, multithreading can help.

Optimising Database Performance Using Dapper

Thu, 27 Mar 2025 00:00:00 GMT

Dapper is a lightweight micro-ORM for .NET that offers high-speed data access while keeping things simple. Unlike full-fledged ORMs like Entity Framework, Dapper focuses on raw SQL execution with minimal overhead. If you're working on an application where performance matters, Dapper can be a great choice.

CancellationToken in .NET: What Are They and Why Should You Use Them?

Sat, 22 Mar 2025 00:00:00 GMT

If you work with .NET and asynchronous tasks, you've probably encountered the need to cancel an ongoing operation. This is where Cancellation Tokens (CancellationToken) come into play, a crucial tool for improving performance and responsiveness in your applications. When dealing with long-running tasks like database queries, HTTP requests, or CPU-intensive processes, it’s important to be able to stop them if they’re no longer necessary. This prevents wasting resources and makes your application more efficient.

Blog con Next.js

Wed, 12 Mar 2025 00:00:00 GMT

Blog con Next.js

9 Ways to Set the URLs for an ASP.NET Core App

Mon, 20 Jan 2025 00:00:00 GMT

In this article, we’ll explore 9 ways to set the URLs for your ASP.NET Core app, with practical examples to help you decide which method suits your needs.

Top 12 Best PracticesTop 12 Best Practices for REST APIs using C# .NET

Sat, 11 Jan 2025 00:00:00 GMT

Designing a good RESTful API remains a crucial part of modern application development. With the rise of mobile applications, distributed architectures, and microservices, creating APIs that are easy to use, efficient, and secure is more important than ever. This article will explore 12 best practices for building REST APIs, focusing on C# .NET.

Uploading Images in Next.js (File Uploads, Filestack)

Sat, 02 Nov 2024 00:00:00 GMT

Uploading images in Next.js is a common task when developing web applications.

Wedding App

Sat, 12 Oct 2024 00:00:00 GMT

Wedding App Adrian & Ana

Rest API in C#

Fri, 03 May 2024 00:00:00 GMT

In C#, there are two main options for creating APIs: SOAP (Simple Object Access Protocol) and REST (Representational State Transfer).

Design Patterns

Tue, 30 Apr 2024 00:00:00 GMT

This repository contains a Visual Studio Code solution for implementing various design patterns in C# using .NET Core. Each design pattern is implemented in a separate console project within the solution.

Installing Docker in .NET 8 and React Projects

Sun, 04 Feb 2024 00:00:00 GMT

Installation and configuration of docker for Dotnet 8 and React, I have also added some commands that will help us.

Asynchrony in Programming with Async/Await

Wed, 24 Jan 2024 00:00:00 GMT

Asynchrony is an essential tool in modern programming, designed to enhance the efficiency and responsiveness of applications.

Algorithms in C#

Sat, 29 Jul 2023 00:00:00 GMT

Welcome to the Algorithms in C# repository! In this project, you will find implementations of various popular algorithms written in C#. The goal of this repository is to provide examples of common algorithms and serve as a reference for students and developers looking to learn and improve their C# and algorithmic skills.