Well no, Mono 1.2 only supports ASP.net 1.1 and the next version (2.0) would support ASP.net 2.0

There are support for many things in ASP.net 2.0 in current Mono 1.2, but missing support for webparts and other things. You can see the Mono ASP.net FAQ here (http://www.mono-project.com/FAQ:_ASP.NET), and the ASP.net 2.0 test status here (http://www.mono-project.com/ASPTests).