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You use ASP.NET to build web applications. Because it’s part of .NET Framework, you’ll use the same tools and similar code as when you write Windows desktop applications or service-oriented ones. Isn’t that great? So what’s new about ASP.NET 4.0 that you can’t get in previous versions? Before we get into the specifics, let’s install ASP.NET and then take a quick look at ASP.NET fundamentals.
ASP.NET 4.0 can run on top of Internet Information Services (IIS) 6.0 (Windows Server 2003), IIS 7.0 (Windows Server 2008 and Windows Vista), or IIS 7.5 (Windows Server 2008 R2 and Windows 7). ASP.NET uses Visual Studio as the integrated development environment (IDE) that it uses to create applications. To start building applications based on ASP.NET, you first need to install its runtime and a developer tool: