Is it possible to create and maintain a .Net framework 1.1 application with Visual Studio 2005?
Actually there is a MSBuild extension that allow this scenario. It is called MSBee and you can find it on CodePlex.
MSBuild Extras – Toolkit for .NET 1.1 “MSBee” is an addition to MSBuild that allows developers to build managed applications using Visual Studio 2005 projects that target .NET 1.1.
No visual studio 2005 only allows you to work with .net 2.0 and above.
Actually, yes, you can, but it's not pretty and you still need .Net 1.1 on the machine. What you can't do is use Visual Studio to compile or build the site or open the solution file. You'll have to build it all from the command line. You'll get either spotty or incorrect intellisense support.
But you can use it like any other text editor to create the source files you need.
No Visual Studio 2005 only works with the 2.0 .Net Framework. If you want to maintain a 1.1 application you'll need to either use Visual Studio .Net or Visual Studio 2003.
MSBuild Toolkit for .NET 1.1 “MSBee” compile from vs2005 to net1.1 bot only in webform, dontwork in asp.net...
来源：https://stackoverflow.com/questions/536992/visual-studio-2005-and-net-framework-1-1