ASP.NET Documentation

What is ASP.NET?

ASP.NET is a powerful, feature-rich framework for building modern web applications and services with .NET. It provides a unified programming model that spans the entire spectrum of web development, from simple pages to complex, data-driven sites.

Whether you're creating Razor Pages, MVC applications, Web APIs, or real‑time SignalR hubs, ASP.NET gives you the tools to build fast, secure, and scalable solutions.

Key Features

• Unified development model for Razor Pages, MVC, Web API, and Blazor.
• Built‑in dependency injection and middleware pipeline.
• High‑performance runtime with Kestrel server.
• Cross‑platform support (Windows, Linux, macOS).
• Integrated security, authentication, and authorization.

Quick Start

Run the following command to create a new ASP.NET Core web app:

dotnet new webapp -o MyWebApp
cd MyWebApp
dotnet run

Open https://localhost:5001 in your browser to see the starter app.

Sample Code: Hello World Controller

using Microsoft.AspNetCore.Mvc;

namespace MyWebApp.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class HelloController : ControllerBase
    {
        [HttpGet]
        public IActionResult Get() => Ok("Hello, ASP.NET!");
    }
}

Visit /hello after adding this controller to view the response.