C# for Beginners

From your first program to classes, structs, records, exceptions, lambdas and LINQ.

Free14 modules134 lessons3 exercises≈ 7 h

Tests check every exercise: in your browser and in the cloud

The course has no tasks to solve on the site: you practise with quizzes and by running the lesson examples yourself. To run them on your computer, set it up in two steps.

1
Install the .NET 10 SDK
The lessons use C# 14, which comes with the .NET 10 SDK. Install the SDK, not only the runtime.
- Download the installer for your system from dotnet.microsoft.com/download/dotnet/10.0 and run it.
- The guide File-based apps shows how to run a single .cs file, the way every lesson example is written.
2
Install an editor
Pick one of the two.
- VS Code with the C# Dev Kit extension works on Windows, macOS and Linux.
- Visual Studio Community is a free all-in-one editor for Windows.

Syllabus

Programs and the compilerTheory
Hello, World!Theory
Quiz — Write and WriteLineQuiz
Compile errorsTheory
Quiz — letter caseQuiz
The Main methodTheory
Quiz — top-level statementsQuiz

Set up your computer

Install the .NET 10 SDK

Install an editor

Syllabus

01Your first program≈ 20 min7 lessons

02Variables and types≈ 20 min8 lessons

03Operators≈ 25 min10 lessons

04Conditions and loops≈ 50 min13 lessons

05Methods≈ 25 min8 lessons

06Arrays≈ 25 min9 lessons

07Strings≈ 45 min10 lessons

08Lists, dictionaries and sets≈ 35 min10 lessons

09Classes and objects≈ 35 min11 lessons

10Value and reference types≈ 35 min11 lessons

11Inheritance and interfaces≈ 30 min10 lessons

12Enums, records and patterns≈ 25 min8 lessons

13Exceptions≈ 40 min9 lessons

14Lambdas and LINQ≈ 30 min10 lessons