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Run your first C# program

Meet the .NET runtime and print output from a C# program.

15 min 5-question quiz 1 code exercise

By the end of this lesson you can

Recognize a C# entry point and identify the language/runtime versions used.

C# is a statically typed language in the .NET ecosystem. Source code is compiled to intermediate language and executed by the .NET runtime. C# has many versions: this track uses C# 12 on .NET 8.0.402 through Wandbox. C# 12 features include primary constructors and collection expressions, though this beginner track starts with familiar class and method syntax.

Program.cs · C# 12

1using System;
2
3class Program
4{
5    static void Main()
6    {
7        Console.WriteLine("Hello, C# 12!");
8    }
9}

Output

Hello, C# 12!

A .cs file contains C# source. Main is the entry point in this traditional program shape; newer C# also supports top-level statements. Exercises compile and run with .NET 8.0.402 on Wandbox, a free public service. Submitted source and test input are sent there.

Key takeaways

C# is compiled and runs on the .NET runtime.
This track uses C# 12 and .NET 8.0.402.
The service compiles and executes each exercise.

Lesson quiz

5 questions · pass with 4 correct · up to 50 XP

Passing this quiz completes the lesson and keeps your streak going. Questions you miss come back in review sessions later.

Practice: write C#

Write C# 12 in the editor and run it against sample input. .NET 8 compiles and runs the code through Wandbox, a free public service; your source and test input are sent there.

Exercise 1

Print a greeting

+25 XP

Print exactly Hello, learner! followed by a newline.

Greeting

main.c

Loading editor…

C# 12 code is compiled and run with .NET 8 on Wandbox, a free public service. Your source code and test input are sent to that service.

Questions about this lesson

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