Definition
ASP.NET is Microsoft's original server-side web application framework, first released in 2002 as part of the .NET Framework, used to build dynamic websites, web APIs, and services with C# or VB.NET.
Overview
ASP.NET introduced the Web Forms model, an event-driven approach with server controls and view state that felt similar to building a desktop application, and later added the MVC (Model-View-Controller) pattern and Web API for more modern, testable architectures. It ran only on Windows and IIS as part of the classic .NET Framework. Most new projects today are built on its successor, ASP.NET Core, the cross-platform rewrite of the framework, though many long-lived enterprise systems still run on the original ASP.NET. Both versions integrate closely with Azure for hosting and with the rest of Microsoft's developer tooling. Teams evaluating this space often compare it with Blazor as part of the same shortlist.
Key Features
- Web Forms model with server controls and view state for rapid UI development
- MVC pattern for more structured, testable web applications
- Web API framework for building HTTP services
- Tight integration with IIS and Windows Server hosting
- Built-in membership and role-based authentication providers