DefaultDbValue

Initial value used when evolving the database or creating the database.

This value should be in the format expected by the database engine. For example 0 or 1 for a boolean using SQL Server.

Should be 'stringvalue' for a string default value.

Initial value

Initial value used in-memory.

Should be true/false or nothing for null (if nullable) or other value depending on type of attribute.

Allow Null

Controls both the in-memory nullability and database attribute setting. If this is false, most database engines require a DefaultDbValue to evolve the database. If no value is provided, the existing rows (objects) in database will get an invalid value and the evolve will fail.