Your First C# Program – Hello World Explained

1Your First C# Program

Hi friends, in this article we will write our first C# program: Hello World. You will learn how a C# program starts, what Console.WriteLine() does and how to run your code. This is the first practical step towards building applications using C# and .NET.

2Why Do We Start With Hello World?

Almost every programming language has a beginner-level Hello World program.

3Understand the Important Parts

1. Console

Console is a .NET class used to perform input and output operations in a terminal.

2. WriteLine()

It displays text and moves the cursor to the next line.

3. String

A string is text enclosed within double quotes, such as "Hello World".

4. Semicolon

A semicolon marks the end of a C# statement.

4Let's Write the Code

Create a console application using the .NET CLI:

dotnet new console -n HelloWorld
cd HelloWorld

Open Program.cs and write the following code:

// My first C# program
Console.WriteLine("Hello World!");

Console.WriteLine("Welcome to C# programming.");

We use Console.WriteLine() twice to display two messages. The blank line in the code is only for readability; it does not produce an empty output line.

5Check the Program Result

Run the application from your terminal:

dotnet run

Hello World!
Welcome to C# programming.

Both messages appear on separate lines because WriteLine() moves the cursor to the next line after printing.

6Watch Your First Program Run

Follow the code in the editor and see how the terminal displays each message.

Notice that each WriteLine() statement produces a new line in the terminal.

7What Have We Learned?

You have written and executed your first C# program. You now understand how Console.WriteLine() displays messages and how to run a console application.

8Questions Interviewers Love to Ask