GitHub Copilot Agents with Visual Studio 2026 Made Easy. Debug, Test, Profile, Refactor, and Modernize C# and .NET Applications with AI-Assisted Development - Voon Kiong Liew

GitHub Copilot Agents with Visual Studio 2026 Made Easy is a practical beginner-to-intermediate guide for developers, students, educators, and .NET professionals who want to use AI-assisted development effectively inside Visual Studio 2026.

As programming tools become more intelligent, developers are no longer limited to writing code manually line by line. With GitHub Copilot and agent-style workflows, you can explain unfamiliar code, debug errors, generate unit tests, improve performance, refactor messy methods, review security risks, modernize older applications, and build complete C# projects more efficiently.

This book teaches you how to use Copilot as a development assistant, not as a replacement for understanding. You will learn how to write better prompts, review AI-generated code, test suggestions, and make responsible programming decisions.

Inside this book, you will learn how to:

Use GitHub Copilot effectively in Visual Studio 2026

Understand Copilot Chat, inline suggestions, and agent-style workflows

Write better prompts for coding, debugging, testing, and refactoring

Use Copilot to explain existing C# code

Fix common C# errors with AI assistance

Generate unit tests with xUnit and MSTest

Improve code quality, naming, validation, and maintainability

Optimize LINQ and Entity Framework queries

Modernize older .NET and Windows Forms applications

Use Copilot with ASP.NET Core APIs

Review code for security, validation, sensitive data exposure, and error handling

Create custom Copilot agent-style workflows

Use Copilot responsibly in education and professional development

Build a complete AI-assisted C# Sales Order Calculator project

This book is written in a clear, step-by-step style with practical examples, prompts, code samples, mini projects, chapter summaries, and exercises. It is especially suitable for readers who want to learn how AI can support real programming work while still building strong software development fundamentals.

Whether you are a student learning C#, an educator teaching programming, a Windows Forms developer maintaining older applications, an ASP.NET Core developer building APIs, or a professional .NET programmer exploring AI-assisted workflows, this book will help you become more productive, more confident, and more systematic in modern software development.

Learn how to debug, test, profile, refactor, modernize, and build better C# and .NET applications with GitHub Copilot Agents and Visual Studio 2026.