http://msmvps.com/blogs/manoj/archive/2005/11/20/76046.aspxNullable types, put in simple terms can be thought of as a way of having nullable value types. Quite obviously, one of the largest applicability of this concept is that of database programming, where you can associate a null value with any datatype. NotenCommunityServer 2008.5 SP2 (Build: 40407.4157)