在SQL Server Management Studio中标记不为空的持久化计算列

It is possible in SQL Server 2005 to create a computed column that is both persisted and is defined as NOT NULL (cannot contain a null value). The 2nd attribute is of importance when using libraries like Linq2Sql if we want to avoid a lot of manual work to assure our code that the column 'always' has a value.It is possible in SQL Server 2005 to create a c