https://www.dotnetzone.gr:443/cs/blogs/abekiaris/archive/2009/06/03/multiple-inheritance-for-net-is-here.aspxI though i should post on this one cause its far more than interesting suppose you have a Customer that is a Person public class Person { public string Name { get; set; } } public class Customer : Person { } and implements 2 interfaces ICustomUser,ICustomerelCommunityServer 2.1 SP3 (Build: 20423.1)