C# / Live sample

record Lesson(string Title, bool Complete);

var ready = lessons
    .Where(lesson => lesson.Complete)
    .Select(lesson => lesson.Title);

await Console.Out.WriteLineAsync(string.Join(", ", ready));

Room310 / Study / C#

Learn C#.

Six chapters covering .NET programs, control flow, methods and collections, object-oriented design, interfaces, generics, LINQ, files, exceptions, async, and testing.

Six chapters

C# curriculum

Build clear .NET applications with strong types, objects, LINQ, files, and asynchronous work.

CSHARP01

.NET Programs, Types & Input

Understand the .NET execution model and write strongly typed console programs with variables, conversions, calculations, and validated input.

Open chapter →CSHARP02

Conditionals, Patterns & Loops

Control execution with boolean logic, switch expressions, loops, pattern matching, and careful boundary handling.

Open chapter →CSHARP03

Methods, Arrays & Collections

Decompose behavior into methods and work effectively with arrays, lists, dictionaries, sets, and collection transformations.

Open chapter →CSHARP04

Classes, Records & Object-Oriented Design

Model valid objects with classes and records, encapsulate state, use inheritance carefully, and compose focused behavior.

Open chapter →CSHARP05

Interfaces, Generics & LINQ

Design abstractions with interfaces, write reusable generic code, and query in-memory data with expressive LINQ pipelines.

Open chapter →CSHARP06

Files, Exceptions, Async & Testing

Persist structured data, handle failures intentionally, perform asynchronous I/O, and verify behavior with automated tests.

Open chapter →