C# Introduction

C# (say "C sharp") is a modern, versatile language from Microsoft. It is used for Windows and web apps with ASP.NET, for games in Unity, and for mobile apps. C# runs on the .NET platform and works on Windows, macOS and Linux.

ExampleC#

using System;

class Program
{
    static void Main()
    {
        Console.WriteLine("Hello, World!");
    }
}

Output

Hello, World!

using System; brings in common types. Console.WriteLine prints a line. Main is where the program starts. To try an example, create a project with dotnet new console and paste the code into Program.cs, then dotnet run.

Quick check

Which method prints a line in C#?

Console.WriteLineSystem.out.printlnecho

Finish the quick check (and any code exercise) to complete this lesson, or mark it done yourself.

Tip: use the left and right arrow keys to move between lessons.