Runs in your browser · .NET WebAssembly

C# playground

Edit real design-pattern code right here — pick an example or write your own, then hit Run. It compiles and executes entirely in your browser: no install, no server, nothing to set up.

Load an example

C# · runs in your browser

using System;

Console.WriteLine("Hello from C# running in your browser!");

for (int i = 1; i <= 5; i++)
    Console.WriteLine($"{i} x {i} = {i * i}");

These run because they're self-contained C#. Patterns that need a database, HTTP, or DI (EF Core, ASP.NET, MediatR) are covered in full in Design Patterns That Deliver →