Free C# practice
Try C# in your browser
Write and run real C# code right here, with six short exercises from the first days of our 60-day .NET course. There is nothing to install and no sign-up.
- Six guided exercises, from Hello World to your first class
- Instant feedback: press Check my answer and we test your code
- A hint in Hinglish for every exercise
- Your code stays in your browser. Nothing is sent to us.
The C# compiler downloads once (about 5 MB) and then runs inside your browser. It works best in the latest Chrome, Edge, Firefox or Safari.
What you will practise
Each exercise builds on the one before. They follow the order we teach in the Foundation phase of the course.
- 1. Say helloPrint text on the screen with Console.WriteLine.
- 2. Store values in variablesUse string and int variables and put them into a sentence.
- 3. Pass or failRead input and make a decision with if and else.
- 4. Multiplication tableRepeat work with a for loop.
- 5. Even or odd, with a methodWrite a method that returns true or false.
- 6. Your first classCreate a class with fields, a constructor and a method.
Common questions
Is it really free?
Yes. There is no fee, no sign-up and no limit on how often you run your code.
Do I need to install Visual Studio?
No. The C# compiler runs inside your browser, so you can start right away on a laptop or a phone.
Is my code saved?
Your code is saved only in this browser on this device, so you can come back to it later. It is never sent to us.
How do I give my program input?
Type it in the Input box, one value per line. Each Console.ReadLine() call reads the next line.
Which version of C# is this?
C# 12 on .NET 9. Programs run inside the browser, so reading files, using the internet and async code are not available here.
What should I do next?
Join our free demo class on Saturday at 11 AM, at our Mira Road East centre or online, and write C# with our lead trainer.
Ready for the next step?
In the free Saturday demo class you write your first C# class and connect it to SQL Server, with our lead trainer beside you.