IntroductionItisnowclosetoayearsinceMicrosoftVisualC#3.0shippedaspartofVisualStudio2008.IntheVSManagedLanguagesteamwearehardatworkoncreatingthenextversionofthelanguage(withtheunsurprisingworkingtitleofC#4.0),andthisdocumentisafirstpublicdescriptionoftheplannedlanguagefeature