{"id":42,"date":"2021-12-21T09:26:58","date_gmt":"2021-12-21T02:26:58","guid":{"rendered":"https:\/\/csharptutorial.net\/?page_id=42"},"modified":"2023-03-05T21:55:38","modified_gmt":"2023-03-05T14:55:38","slug":"csharp-hello-world","status":"publish","type":"page","link":"https:\/\/www.csharptutorial.net\/csharp-tutorial\/csharp-hello-world\/","title":{"rendered":"C# Hello World"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you’ll learn how to create a simple program that displays the famous message Hello, World! on a console window.<\/p>\n\n\n\n

Creating the C# hello world program<\/h2>\n\n\n\n

First, launch Visual Studio.<\/p>\n\n\n\n

Next, click the Create a New Project<\/strong> button:<\/p>\n\n\n\n

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Then, select the Console App to create a project for a command-line application that runs on .NET core on Windows, Linux, and macOS, and click the Next button:<\/p>\n\n\n\n

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After that, configure the new project by entering the project name, location, and solution name, and click the Next button:<\/p>\n\n\n\n

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Finally, select the .NET framework, 6.0 (Long-term support) in this case and click the Create button:<\/p>\n\n\n\n

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The Visual Studio will show up as follows:<\/p>\n\n\n\n

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On the left-hand side is the code editor where you can enter the C# code. By default, Visual Studio automatically generates a statement that shows the Hello, World!<\/code> message.<\/p>\n\n\n\n

Also, Visual Studio shows the solution explorer on the right pane. A solution may contain one or more projects. In this example, the HelloWorld<\/code> solution has one project with the same name. <\/p>\n\n\n\n

Under the HelloWorld<\/code> project is the source code file program.cs<\/code>. Note that all C# source code files have the extension .cs<\/code> that stands for CSharp.<\/p>\n\n\n\n

The following shows the contents of the program.cs file:<\/p>\n\n\n

\/\/ See https:\/\/aka.ms\/new-console-template for more information<\/span>\nConsole.WriteLine(\"Hello, World!\"<\/span>);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
In this program:<\/p>\n\n\n\n
The first line that starts with double forward slashes \/\/<\/code>  is a comment. It doesn’t have any effect on the program:<\/p>\n\n\n
\/\/ See https:\/\/aka.ms\/new-console-template for more information<\/span><\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
The second line writes the message \"Hello, World!\"<\/code> to the console:<\/p>\n\n\n
Console.WriteLine(\"Hello, World!\"<\/span>);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
In this code, the Console.WriteLine<\/code> is a method that accepts a text as the input and writes that text to the console window.<\/p>\n\n\n\n
To run the program, you click the HelloWorld<\/code> button or press the F5 keyboard. Behind the scene, VS will compile and run the program. The following console window will display the “Hello, World!” message:<\/p>\n\n\n\n
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Congratulation! you have successfully created and run the Hello, World! program.<\/p>\n\n\n\n
Using the using static syntax<\/h2>\n\n\n\n
C# 6 allows you to shorten the code by using the “using static<\/code>” syntax. So instead of using the Console.WriteLine<\/code> every time you write a string to the console:<\/p>\n\n\n
Console.WriteLine(\"Hello, World!\"<\/span>);<\/code><\/span>Code language:<\/span> C#<\/span> (<\/span>cs<\/span>)<\/span><\/small><\/pre>\n\n\n
You can use the using static<\/code> syntax like this:<\/p>\n\n\n
using static<\/span> System.Console;\n\nWriteLine(\"Hello, World!\"<\/span>);<\/code><\/span>Code language:<\/span> JavaScript<\/span> (<\/span>javascript<\/span>)<\/span><\/small><\/pre>\n\n\n
By doing this, you can use the WriteLine<\/code> method everywhere in the file without specifying the Console<\/code>.<\/p>\n\n\n\n
Summary<\/h2>\n\n\n\n
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  • Use Visual Studio to create a Console App project for creating a command-line program that runs on .NET core on Windows, macOS, and Linux.<\/li>\n\n\n\n
  • Use Console.WriteLine<\/code> method to write a string to the console window.<\/li>\n<\/ul>\n
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