Getting Started with C#

Write your first C# program, understand the class structure, and get comfortable with Console.WriteLine.

beginner

2

Variables and Types

Learn value types, reference types, constants, type conversion, and nullability in C#.

beginner

3

Variables

Declare variables with var and explicit types, use const and readonly, and understand C# type inference.

beginner

4

Data Types

Integers, floats, booleans, chars, and type conversions in C#.

beginner

5

Print Formatting

Master Console output, string interpolation, composite formatting, and format specifiers in C#.

beginner

6

Strings

String creation, interpolation, formatting, and common string methods in C#.

beginner

7

Control Flow

if/else, switch expressions, ternary operator, and short-circuit evaluation.

beginner

8

Loops

for, while, do-while, foreach — all the ways to repeat code in C#.

beginner

9

Dictionaries and Sets

Dictionary<K,V>, HashSet<T>, iteration, and common collection patterns in C#.

beginner

10

Methods

Define and call static methods, use parameters and return values, and understand method overloading.

beginner

11

Arrays

Single and multi-dimensional arrays, iterating, sorting, and Array class methods.

beginner

12

Functions and Methods

Static methods, parameters, return types, overloads, optional/named args, and expression bodies in C#.

beginner

13

Lists and Collections

List<T>, Dictionary<K,V>, HashSet<T> — C#'s generic collections.

beginner

14

Properties and Value Semantics

Fields, auto-properties, computed properties, init-only setters, and value vs reference semantics in C#.

intermediate

15

Classes and Objects

Define classes, create objects, write constructors, and understand instance methods.

intermediate

16

Structs and Classes

Defining classes, constructors, access modifiers, inheritance, and structs in C#.

intermediate

17

Properties

Auto-properties, get/set, computed properties, and init-only properties.

intermediate

18

Inheritance

Base classes, derived classes, virtual/override methods, abstract classes, and sealed.

intermediate

19

Error Handling

Exceptions, try/catch/finally, custom exceptions, and the Result pattern in C#.

intermediate

20

Interfaces

Define contracts with interface, implement multiple interfaces, and use default interface methods.

intermediate

21

Enums

Define enumerated types, use Flags enums for bit fields, and parse enums from strings.

beginner

22

Namespaces and Modules

Namespaces, using directives, file-scoped namespaces, access modifiers, and NuGet packages in C#.

intermediate

23

Async/Await and Concurrency

async/await, Task, Task<T>, parallel execution, cancellation, and thread safety in C#.

intermediate

24

Exception Handling

try/catch/finally, throwing exceptions, custom exceptions, and when to use exceptions.

intermediate

25

Generics

Generic classes, methods, constraints, and covariance/contravariance.

intermediate

26

LINQ Basics

Query collections with LINQ: Where, Select, OrderBy, GroupBy, First, Aggregate.

intermediate

27

Async/Await

Write asynchronous code with async/await, Task, Task<T>, and understand the threading model.

intermediate

28

JSON Encoding

Serialize and deserialize JSON with System.Text.Json, custom converters, and JsonNode in C#.

intermediate

29

Nullable Types

Nullable value types, nullable reference types, null-safety operators, and best practices.

intermediate

30

Pattern Matching and switch

switch expressions, type patterns, property patterns, positional patterns, and guard clauses in C#.

intermediate

31

Pattern Matching

switch expressions, type patterns, property patterns, list patterns, and deconstruction.

intermediate

32

Records and Value Objects

record types, value equality, non-destructive mutation with with, and positional records.

intermediate

33

Delegates and Events

Delegates as type-safe function pointers, Func and Action, events, and lambdas.

intermediate

34

File I/O

Read and write files with System.IO, work with paths, and stream large files.

intermediate

35

Testing

Unit testing with xUnit, assertions, test organisation, and mocking basics.

intermediate

36

HTTP Basics

Make HTTP requests with HttpClient, parse JSON responses, and handle HTTP errors.

intermediate

Learn C#

All Tutorials

Getting Started with C#

Variables and Types

Variables

Data Types

Print Formatting

Strings

Control Flow

Loops

Dictionaries and Sets

Methods

Arrays

Functions and Methods

Lists and Collections

Properties and Value Semantics

Classes and Objects

Structs and Classes

Properties

Inheritance

Error Handling

Interfaces

Enums

Namespaces and Modules

Async/Await and Concurrency

Exception Handling

Generics

LINQ Basics

Async/Await

JSON Encoding

Nullable Types

Pattern Matching and switch

Pattern Matching

Records and Value Objects

Delegates and Events

File I/O

Testing

HTTP Basics

Why learn C#?

What you'll learn in this C# tutorial

C# tutorial topics

Who is this C# course for?