Architecting ASP.NET Core Apps: Decoupling Business Logic and Services

As ASP.NET Core applications grow, keeping business logic, database queries, and HTTP routing inside controllers leads to bloated, hard-to-maintain code. This text-based course guides you through the foundational concepts of software architecture, teaching you how to decouple your codebase by moving database queries and core logic into dedicated, reusable service classes. By reading through clear explanations and studying structured code snippets, you will transform tightly coupled controllers into clean, modular, and testable components. You will master the patterns required to build maintainable web applications that can easily scale as requirements change. What you'll learn: - Understand the core principles of separation of concerns and clean architecture - Extract database queries and business logic out of controllers and into dedicated service layers - Configure and resolve dependencies using the built-in ASP.NET Core dependency injection container - Apply lifetime scopes such as transient, scoped, and singleton to services correctly - Implement clean interfaces to decouple service implementations from their consumers - Structure your project to support easier unit testing of business logic The course begins with foundational definitions of software architecture and dependency injection before walking you through step-by-step refactoring patterns. You will progress from tightly coupled code to a highly modular architecture using modern ASP.NET Core design patterns. This course is designed for beginner backend developers and web programmers who understand basic C# and ASP.NET Core but want to learn how to structure their applications professionally. No advanced architectural experience is required. Start writing cleaner, more maintainable ASP.NET Core code today.