ASP 3.0 is the latest version of ASP, but there will never be an ASP 4.0 version.
ASP .NET is the next generation ASP, but it’s not an upgraded version of ASP. ASP .NET is an entirely new paradigm for server-side ASP scripting.
ASP .NET is a part of the new .NET (dotnet) Framework. Microsoft spent three years rewriting ASP .NET from the ground up, and ASP .NET is not fully backward compatible with ASP 3.0.
You can read more about the differences between ASP and ASP .NET in the next chapter of this tutorial.
The .NET Framework is the infrastructure for the new Microsoft .NET Platform.
The .NET Framework is a common environment for building, deploying, and running Web applications and Web Services.
The .NET Framework contains a common language runtime and common class libraries – like ADO .NET, ASP .NET and Windows Forms – to provide advanced standard services that can be integrated into a variety of computer systems.
The .NET Framework provides a feature-rich application environment, simplified development and easy integration between a number of different development languages.
Microsoft’s Visual Studio.NET is a common development environment for the new .NET Framework.