Learn C# from Scratch

What is C#?

C# (pronounced “C Sharp”) is a modern programming language created by Microsoft.

Installing the environment

To get started with C#, you need to install Visual Studio, the recommended development environment (IDE).

Visit the official Visual Studio page.

Write your first code

Now you can create a new console project and write the following:

Console.WriteLine("Hello, LuisLlamas.es!");

You now have your first program in C#, the classic “Hello, World”.

Compile and run

Once you write your code, compile the program in Visual Studio and run it to see the results.

C# will handle translating your code to something the computer understands. Congratulations! Wasn’t that easy?

Variables

Variables in C# allow you to store information like numbers, text, or boolean values (true/false).

int value = 10;
int sum = value + 5;

With C# you can perform mathematical operations like addition, subtraction, multiplication, and division. Perfect for simple and complex calculations!

Conditionals

Conditionals in C# allow you to make decisions. Using if you can make the program act one way or another depending on the conditions.

int number = 5;
if (number > 0) {
    Console.WriteLine("The number is positive.");
}

Loops

Loops allow you to repeat actions. With for, while, or foreach, you can make C# repeat a task multiple times.

for (int i = 1; i <= 5; i++) {
    Console.WriteLine(i);
}

Methods

Methods are blocks of code that perform a specific task. They allow you to organize and reuse your code.

public int Add(int a, int b) {
	return a + b;
}

Classes and objects

C# is an object-oriented language. This means you can create classes that represent real-world objects, like a car or an animal, and manipulate their properties.

Arrays and collections

In C#, you can use collections like arrays, lists, or dictionaries to store groups of data. For example, a list of numbers or a list of names.

What is a library?

Libraries are collections of code that we keep together to make them easier to reuse.

They allow us to save time and effort by not having to write everything from scratch.