Pre Default Value will be defaulted when new record is created. Post Default Value will be defaulted if there is no value specified for the field. so, Pre Default Value will be stored in the Database. harsha: you can add quistions by clicking the hyperlink on the above bar "Ask Quistion".

Whenever a record gets created Predefault value takes prescedence and get sets, however suppose if you now blank out that value and step off the record Post default value will be set on that field.So postdefault value get sets when you actually save the record and field should be blank