The difference between null and DBNull.Value

"null"   means   the   object   reference   is   invalid   in   .NET,   when   you   retrieve   a   NULL   value   from   the   Database,   it   is   a   valid   value   to   .NET,   and   it   is   represented   by   System.DBNull.Value.

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null在.net中意思是对象无效，但是当你在数据库中查找NULL值时，对于.net确是有效的，他的值就是DBNull.Value

转载于:https://www.cnblogs.com/jimmypony/archive/2008/07/19/1246447.html