http://developers.de/blogs/bahro/archive/2014/10/20/new-feature-in-c-6-0-primary-constructors.aspxPrimary constructors reduced declaration of various contructors with diferent arguments. Primary constructors is declare on the type declaration and this is why it so special. For example: public class Person ( string defaultName) { private string m_NameenCommunityServer 2008 SP1 (Build: 30619.63)