The History of C# - C# Game Programming: For Serious Game Creation - page 17

Summary
C# is a modern, garbage-collected, objected-orientated language and it's come a
long way since its debut at the July 2000 Microsoft Professional Developers
Conference in Orlando. C# runs on a virtual machine called the Common Lan-
guage Runtime or CLR for short. The CLR can be used to run many different
languages in the same program.
C# is a living language; as time passes more functionality and features are added.
There have been four major versions of C# and each has brought new and useful
features. These features can often make programs easier to write and more effi-
cient so it's important to keep up with the changes. C# 4.0, the latest version, was
released in April 2010.