Online C# Compiler

Write and run C# code directly in your browser with this free online compiler. C# is a modern, type-safe language developed by Microsoft, widely used for building Windows applications, web services with ASP.NET, and games with Unity. This compiler lets you execute C# programs instantly without installing Visual Studio or the .NET SDK.

What is C#?

C# is a modern, object-oriented programming language developed by Microsoft under the leadership of Anders Hejlsberg in 2000. It runs on the .NET runtime and combines the power of C++ with the simplicity of Visual Basic. C# has evolved significantly over the years, adding features like LINQ, async/await, pattern matching, records, and top-level statements. It is the primary language for .NET development, including ASP.NET web applications, MAUI cross-platform apps, and Unity game development.

Key Features

• Type-Safe: Strong typing prevents common programming errors at compile time.
• Async/Await: Built-in support for asynchronous programming.
• LINQ: Language-Integrated Query for working with collections and data.
• .NET Ecosystem: Access to thousands of libraries and NuGet packages.
• Cross-Platform: .NET runs on Windows, macOS, and Linux.

Basic C# Syntax

using System;
using System.Collections.Generic;

// Class definition
class Developer {
    public string Name { get; set; }
    public Developer(string name) => Name = name;
    public void Greet() => Console.WriteLine($"Welcome, {Name}!");
}

class Program {
    static void Main() {
        // Variables
        string site = "LabsICT";
        int year = 2025;

        // Collections and loop
        var languages = new List<string> { "C#", "Python", "Java" };
        foreach (var lang in languages) {
            Console.WriteLine($"Learn {lang} at {site}");
        }

        // Object usage
        var dev = new Developer("Bilal");
        dev.Greet();
    }
}

What Can You Build with C#?

C# is incredibly versatile. Web developers use ASP.NET Core to build high-performance REST APIs and full-stack web applications. Game developers use Unity with C# to create 2D and 3D games for PC, console, and mobile. Desktop developers use WPF, WinForms, or MAUI to build cross-platform applications. C# is also used for cloud services with Azure, enterprise software, IoT applications, and microservices architectures.

Try It Yourself

Type your C# code in the editor and click Run. The compiler supports modern C# features including LINQ, async/await, string interpolation, and collections. Use Copy to save, Reset to restore the example, and Share to generate a link.

Related Resources

Continue with our C# learning track, try more online compilers, or browse tutorials for step-by-step guides.