What is ASP.NET? (Active Server Pages)

September 10, 2025 / Web Hosting

ASP.NET is Microsoft’s web development framework that allows developers to build dynamic, database-driven websites and web applications. Unlike static HTML pages, ASP.NET pages can generate content dynamically on the server before sending it to the browser.

What is ASP.NET?

It is the latest version of Microsoft’s middleware for the web. Built on the .NET Framework, it provides a runtime environment and a class library for developers.

  • The Common Language Runtime (CLR) manages code execution for both Windows and ASP.NET applications.

  • The .NET Framework class library is a collection of reusable components to simplify web and Windows application development.

As a result, it supports developers in creating web-based applications efficiently. Many websites have already adopted .NET technology, making them ready for ASP.NET applications.

What is an ASP.NET File?

It is a file similar to an HTML file but can include HTML, XML, and server-side scripts. These scripts execute on the server, not the client. ASP.NET files use the “.aspx” file extension.

How Does it Work?

When a browser requests an HTML file, the server sends the file directly. However, when a browser requests an ASP.NET file:

  1. IIS passes the request to the ASP.NET engine.

  2. The engine reads the file line by line.

  3. Scripts are executed on the server.

  4. The output is returned to the browser as plain HTML.

Thus, dynamic content is delivered seamlessly without exposing server-side code.

System Requirements

  • Windows 2000, XP, 2003, or Vista

  • Microsoft .NET Framework 2.0

  • Minimum 5MB free disk space

  • Recommended: Microsoft Visual Studio 2005 or Visual Web Developer 2005 Express

How to Install?

  • First, create the Windows installer file (.msi).
  • Next, double-click the .msi file in Windows Explorer. This opens the setup wizard.
  • Then, follow the instructions to complete the installation.

After installing the application, you can see the active server page (ASP) application in the Start – > Settings – > Control Panel – > Add/Remove Programs on your computer. From here, you can run the setup program to uninstall the application at any time you want to uninstall that.

Restore Default ASP.NET Configuration in Plesk: Step-by-step guide to resetting your ASP.NET configuration for seamless hosting.