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C#

C# Programming

Learn C# from your very first line of code to advanced, high-performance .NET. Every topic in order, with interactive diagrams that show what your code really does.

0 of 60 lessons completed · 60 topics in the full course Start learning: What is C# and .NET?

Beginner

1. Getting started

6 topics

What is C# and .NET?Lesson
Your first C# programLesson
Variables and data typesLesson
Type conversion and parsingLesson
Operators and expressionsLesson
Strings, input and outputLesson

Beginner

2. Control flow

4 topics

Decisions with if / elseLesson
switch statements and expressionsLesson
Loops: for, while, do-while, foreachLesson
break, continue and nested loopsLesson

Beginner

3. Arrays and methods

6 topics

ArraysLesson
Multi-dimensional and jagged arraysLesson
Methods and the call stackLesson
Parameters: ref, out, in, params, optional, namedLesson
RecursionLesson
Debugging in Visual StudioLesson

Intermediate

4. Object-oriented programming

11 topics

Classes and objectsLesson
Constructors and object initialisersLesson
Fields and propertiesLesson
Access modifiers and encapsulationLesson
Static members and static classesLesson
InheritanceLesson
Polymorphism: virtual and overrideLesson
Abstract classesLesson
InterfacesLesson
Structs, records and value vs reference typesLesson
EnumsLesson

Intermediate

5. Working with data

9 topics

StringBuilder and string formattingLesson
Dates and timesLesson
Exceptions: try, catch, finally, throwLesson
Collections: List and DictionaryLesson
HashSet, Queue and StackLesson
GenericsLesson
Nullable types and null safetyLesson
Files and streamsLesson
JSON serialisationLesson

Intermediate

6. Functional C# and LINQ

8 topics

Delegates, Func and ActionLesson
Lambda expressionsLesson
EventsLesson
Extension methodsLesson
LINQ basics: Where, Select, OrderByLesson
LINQ: grouping, joins and deferred executionLesson
Pattern matchingLesson
Tuples and deconstructionLesson

Advanced

7. Advanced C#

8 topics

Memory: stack, heap and garbage collectionLesson
IDisposable and usingLesson
Iterators and yieldLesson
async and awaitLesson
Tasks and parallel programmingLesson
Threads, locks and thread safetyLesson
Reflection and attributesLesson
Span<T>, Memory<T> and low-allocation codeLesson

Master

8. Master level

8 topics

SOLID principlesLesson
Design patterns in C#Lesson
Dependency injectionLesson
Unit testing with xUnitLesson
Performance: profiling and benchmarkingLesson
unsafe code, pointers and native interopLesson
Source generatorsLesson
Structuring a real applicationLesson