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How to create a simple .NET app

In this section, you'll learn how to create a simple .NET console app that prints "Hello, World!" to the console. You'll use the .NET SDK and the .NET CLI tools to create and run the app.

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Prerequisites​

To follow this tutorial, you need to have the .NET SDK installed on your computer. You can download and install the .NET SDK from here.

You also need a code editor of your choice. You can use Visual Studio, Visual Studio Code, or any other editor that supports .NET development.

Create the app​

First, open a terminal such as PowerShell, Command Prompt, or bash. Navigate to a folder where you want to create your app. Then, type the following command:

dotnet new console -o HelloWorld

This command creates a new console app project named "HelloWorld" in a subfolder with the same name. The project contains a single C# file named Program.cs with the following code:

using System;

namespace HelloWorld
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
        }
    }
}

This code defines a namespace called HelloWorld, a class called Program, and a method called Main. The Main method is the entry point of the app, where it writes "Hello World!" to the console using the Console.WriteLine method.

Run the app​

To run the app, navigate to the project folder and type the following command:

dotnet run

This command builds and runs the app. You should see the following output:

Hello World!

Congratulations! You've created and run your first .NET app.

Next steps​

To learn more about developing .NET apps, you can follow one of these resources: