Run your C# program to see output here.
Key Features of C# Playground
- Monaco Editor Integration Edit C# with autocomplete, bracket matching, and full syntax highlighting.
- Dual-Pane Layout Write code on the left and inspect outputs, warnings, or errors on the right.
- Judge0 execution engine Run standard C# and .NET Framework libraries inside a secure sandbox.
C# Playground Examples
C# Hello World
Print output to console using System namespace.
Input
using System;
class Program {
static void Main() {
Console.WriteLine("Hello, C#!");
}
}Output
Hello, C#!How to Use C# Playground
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1. Write C# Code
Type your C# program using .NET classes, LINQ, or async/await.
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2. Compile and Run
Click Run or press ⌘↵. Judge0 compiles with the Mono/Roslyn compiler and executes.
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3. View Output
Compiler errors and Console.WriteLine() output appear in the Output panel.
Common Use Cases for C# Playground
- Learning C# Syntax Experiment with namespaces, classes, methods, and basic C# structures.
- Prototyping LINQ Queries Test LINQ queries or collections manipulation offline in the browser.
- Running Simple C# console apps Write, compile, and run C# programs with no local SDK needed.
The Technical Details
The C# Playground uses Judge0 running Mono/csc compilers to run C# code. The code is compiled and ran client-side asynchronously to provide secure and instant execution.
Frequently Asked Questions
Which .NET version is used?
.NET 6 via the Mono runtime on the Judge0 CE sandbox.
Can I use NuGet packages?
No. Only the .NET base class library (BCL) is available.
Is there a time limit?
Yes. Judge0 enforces a few-second execution limit and memory cap.
Is my code private?
Code is submitted to the public Judge0 CE API. Avoid pasting sensitive data.