Introduction to C# in 2025: Where to Start for Beginners

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Introduction: Why C# is Your Best Choice in 2025

The world of development is changing rapidly, but C# (pronounced "see-sharp") remains one of the most in-demand and stable programming languages. In 2025, it continues to hold leading positions thanks to its versatility, powerful .NET ecosystem, and ongoing support from Microsoft. If you are just starting your journey in IT and looking for a reliable language that will open doors to web development, game development (Unity), mobile applications (Xamarin/MAUI), or enterprise solutions — C# is the ideal start.

In this guide, we will break down where to start learning C# in 2025: how to set up your development environment, write your first program, and master basic concepts. No fluff — only practice and up-to-date advice.

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1. Installing and Setting Up the Development Environment

Before writing code, you need to install the .NET SDK — a set of tools for C# development. In 2025, it is recommended to use .NET 9 (or the latest stable version).

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Step 1: Installing the .NET SDK

Go to the official website dotnet.microsoft.com.
Download the installer for your operating system (Windows, macOS, or Linux).
Run the installer and follow the instructions.
Verify the installation by opening a terminal (command line) and entering the command:

dotnet --version

If you see a version number (e.g., 9.0.100), everything is ready.

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Step 2: Choosing a Code Editor

For beginners, Visual Studio Community 2025 (free version) or the lightweight Visual Studio Code with the C# Dev Kit extension are ideal. We recommend starting with VS Code — it is faster and easier to learn.

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Step 3: Creating Your First Project

Open a terminal and run the command to create a console application:

dotnet new console -n MyFirstApp\ncd MyFirstApp

Now open the MyFirstApp folder in your editor. Inside, you will find a file Program.cs — this is the entry point of the program.

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2. First Program in C#: Syntax and Basic Constructs

Let's edit the Program.cs file. In modern versions of C# (starting with .NET 6), a simplified template is used — without explicit class and Main method declarations. Here is a minimal program that prints "Hello, world!" to the screen:

// Program.cs\nConsole.WriteLine("Hello, world!");\nConsole.ReadKey(); // Waits for a key press

Run the program with the command dotnet run. You should see the message in the console.

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Basic Syntax Elements

Variables: strong typing. Example: int age = 25; or string name = "Anna";
Console output: Console.WriteLine() (with newline) and Console.Write() (without newline).
Input: string input = Console.ReadLine();
Conditional statements: if, else if, else.
Loops: for, while, foreach.

Example of a simple input-output calculator:

Console.Write("Enter the first number: ");\nint a = Convert.ToInt32(Console.ReadLine());\n\nConsole.Write("Enter the second number: ");\nint b = Convert.ToInt32(Console.ReadLine());\n\nint sum = a + b;\nConsole.WriteLine($"Sum: {sum}"); // String interpolation

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3. Basics of Object-Oriented Programming (OOP)

C# is a language built on OOP principles. Understanding classes, objects, inheritance, and polymorphism is key to writing efficient code. Let's look at a simple example of a class