There are three versions of ASP.NET that exist to-date.

ASP.NET 1.0

The first release of ASP.NET made on February 13, 2002 with Microsoft .NET Framework 1.0 and Visual Studio.NET 2002.

ASP.NET 1.1

The first major upgrade to .NET Framework resulted in the release of ASP.NET 1.1 with .NET Framework 1.1 and Visual Studio 2003 in April, 2003. The only new features added in this release for ASP.NET were mobile controls and automatic input validation.

ASP.NET 2.0

Released in November 2005, ASP.NET 2.0 is currently the latest version of ASP.NET. ASP.NET 2.0 improves upon the limitations that were discovered in releases 1.0 and 1.1. ASP.NET 2.0 introduces 40+ new controls and other features that reduce development efforts and minimize coding.

For this article we will be using ASP.NET 2.0.