Hello World!

In this lesson, create a simple application to show a message in the console using C#. C# is a general purpose, multi-paradigm programming language designed by Microsoft. Developers use C# to make web servers, desktop applications, games, and much more.

Getting Started with a New Replit Account

Follow the Replit Setup guide to create an account and a new Repl project.

Using Console.WriteLine

The default code in the new Repl project should look something like this:

using System;

class MainClass {
  public static void Main (string[] args) {
    Console.WriteLine("Hello World");
  }
}

The important line is Console.WriteLine("Hello World");. In C#, that line of code will display a message of "Hello World" in the console. Try to change the message from "Hello World" to something else!

Setting the Console Colors

It is possible to change the colors of the C# console. There is a limited set of colors, but they can make the console a little bit more fun.

At the top of the body of the Main method, add the following code:

Console.BackgroundColor = ConsoleColor.Cyan;
Console.ForegroundColor = ConsoleColor.DarkBlue;
Console.Clear();

This will set the colors, and then clear the existing console so that the colors apply to everything. Make sure the capitalization is consistent!

Try out a few different colors to see what works.