I have a whole pile of ASP.NET sites that went into production between 2004 and 2010 and get roughly zero hours per month of development attention. Once every

I have a whole pile of ASP.NET sites that went into production between 2004 and 2010 and get roughly zero hours per month of development attention. Once every few years I spend a few minutes on each one migrating to the latest version of the CLR. I can pull any one of those sites up today and make changes using the latest and greatest features of C#, and they won't complain. Or I can pull out the cruftiest bad practice from .NET 1.1 and have that work too.