C# & .NET from First Principles

Understand the building blocks

Learn how objects represent behavior, how interfaces express contracts, and how asynchronous code handles waiting. Start with the classes and dependency injection lesson, then explore tasks and cancellation.

Your starting point

You should be comfortable with variables, loops, and functions. Install a supported .NET SDK and create a console application with dotnet new console. Run small experiments before introducing a framework.

What you will practice

• Separate behavior from infrastructure.
• Model dependencies explicitly.
• Write asynchronous code that can be cancelled.
• Explain tradeoffs through tests and examples.