🔷 .NET / Mono C# Runtime

Free Online C# Compiler

Write and compile .NET C# code online with Mono / Roslyn compiler engine, LINQ support, and Monaco IDE editor.

💻 Code Example (C# (.NET))

using System;

class Program {
    static void Main() {
        Console.WriteLine("Hello, World from Online C# Compiler!");
        
        string[] languages = { "C#", "Python", "Java", "C++" };
        foreach (var lang in languages) {
            Console.WriteLine("Language: " + lang);
        }
    }
}

Overview of C# (.NET) Compiler

C# is a modern, object-oriented, type-safe programming language developed by Microsoft for enterprise applications, Unity game development, web APIs, and desktop software. Our Online C# Compiler enables you to write, compile, and run C# programs online without installing Visual Studio or the .NET SDK.

Key Platform Features

  • ⚡ Fast Sandbox Execution: Run code in under 2 seconds inside isolated Docker Linux containers.
  • 📝 Monaco Editor Engine: Experience auto-indentation, line numbers, and syntax highlighting powered by VS Code engine.
  • 📬 Interactive Stdin Input: Support for user input reading from stdin terminal interface.
  • 🔒 100% Secure & Private: Code runs purely in memory and is discarded after completion.
  • 📱 Zero Setup Required: Works seamlessly across laptops, tablets, and smartphones without downloads.

How to Compile & Run Code Online

  1. Select your preferred programming language from the top navigation bar.
  2. Type or paste your source code into the Monaco code editor.
  3. If your program requires user input, enter values into the interactive stdin terminal.
  4. Click the green Run Code button to compile and view your program output instantly.

Frequently Asked Questions (FAQ)

Q: Is LINQ supported in this C# compiler?

Yes! System.Linq and standard C# collections like List, Dictionary are fully supported.

Q: Do I need Visual Studio installed on my computer?

No setup is required. Everything compiles and executes directly inside your web browser.