C# Tutorial

This C# tutorial helps you learn C# programming from scratch and shows you how to apply C# to develop your next great application.

Getting started

What is C# – introduce the C# programming language and the .NET
Install Visual Studio 2022 – guide you on how to install Visual Studio 2022 Community edition to start programming C#.
C# Hello World – show you step by step how to create the first C# program that displays the Hello, World! message on the console window.
C# syntax – introduce to you the basic C# syntax, including identifiers, keywords, literals, statements, and comments.

Variables – show you how to declare variables and use them to hold data in the program.
integer – introduce the integral types in C# that hold integer numbers.
float – explain to you the floating-point number types, including decimal, double, and float.
char – cover the character type that represents a single character.
string – discuss the string type and guide you on the basic string operations.
bool – learn how to use the bool type to represent boolean values: true and false.
var – show you how to use the var keyword to declare implicit-typed variables.

if – learn how to check a condition and execute a block if a condition is true.
if else – show you how to check multiple conditions and execute a block if a condition is true or another block otherwise.
if else if – learn how to check multiple conditions and execute a block if a condition is true.
switch – select a statement for execution if an expression matches a pattern.
while – learn how to use the while loop statement to conditionally execute a block of code zero or more times.
do while – show you how to use the do while statement to execute a block one or more times based on a condition.
for – guide you on how to execute a block a specified number of times.
break – show you how to terminate prematurely using the break statement.
continue – learn how to start a new loop iteration prematurely using the continue statement.

Functions – guide you on how to modulize the program and make the code reusable by using functions.
Default parameters – learn how to simplify the function call using default parameters.

Array – show you how to use an array to store a fixed number of elements of the same type.
Multidimensional arrays – learn how to create multidimensional arrays, including 2D and 3D arrays.
foreach – guide you on how to use the foreach statement to iterate over the elements of an array.
Passing an array to a function – show you how to pass an array to a function as an argument.

Class – learn about classes and objects, define a class, and create objects from the class.
this – explain the this keyword in C#.
public vs. private – guide you on how to use the access modifiers public and private, and how to use them effectively.
Constructor – show you how to define constructors to initialize objects.
Property – learn how to use a property that provides a flexible way to read, write, and compute the value of a private field.
Constant – introduce constants and how to define them in a method or class.
Indexer – show you how to use an indexer to allow an object to be indexed like an array.
Object initializer – learn how to initialize accessible fields and properties of an object using an object initializer.

Static field and property – explain the static fields and properties and how to use them effectively.
Static method – learn about static methods and how to use them to define a utility class.
Static constructor – show you how to define a static constructor that initializes static members.
Static class – guide you on how to use a static class to define a utility class.

Inheritance – show you how to define a class that inherits properties and methods of another class.
Inheritance & constructor – explain the constructor calling order and show you how to use the base() syntax to call a specific constructor in the base class.
new modifier – explain the new modifier and how to use it to explicitly hide the member in the base class from the subclass.
virtual modifier – show you how to use the virtual modifier to modify a member of a base class and discuss the differences between new and override methods.
sealed modifier – guide you on the sealed classes and sealed properties and methods.
Casting – explain how to convert a reference from one type to another using casting, including upcasting and downcasting.
Abstract classes – introduce you to the abstract classes with practical examples.
Object – learn about the object that is the base class of all the classes.

Interface – introduce interfaces and how to use interfaces to make the application more flexible and extensible.
Default implementation – show you how to provide a default implementation for an interface member to make the application backward compatible.
Extending interfaces – guide you on how to define an interface that extends a single interface or multiple interfaces.

try…catch – learn about exceptions and how to use the try...catch statement to handle exceptions.
try…catch…finally – show you how to use the try...catch...finally statement to handle exceptions and clean up resources.

Generics – learn how to use generics to write reusable and type-neutral code.
Generic Classes – show you how to define reusable & type-neutral classes.
Generic Constraints – specify what types can be used as the type parameters of the generic types.

Delegates – introduce you to delegates and how to use them to pass methods to other methods as arguments.
Anonymous Methods – guide you on creating anonymous methods.
Lambda Expressions – learn how to use lambda expressions to create anonymous functions.
Events – learn about C# events and how to use the publisher/subscriber pattern to handle events