ADOX When you create an Access table, several additional properties

Chinese	English
Allow empty string	Jet Oledb:allow Zero Length
Unicode compression	Jet oledb:compressed UNICODE Strings
Validation rules	Jet Oledb:column Validation Rule
effectivity text	Jet Oledb:column Validation Text
Required Fields	Nullable
Fixed length	Fixed Length
Default value	Default
Title?	Description

• Use the Attributes property to determine whether the column is a fixed length, or whether it can contain Null values.

• Use the Properties collection to access provider-specific attributes.

Http://www.pcreview.co.uk/forums/re-change-field-required-property-adox-t1685138.html

Http://www.cnblogs.com/flashcloud/archive/2009/01/20/1378881.html

Http://microsoft.public.data.ado.narkive.com/35gKl1SX/adox-access-table-creation-with-nullable-columns-in-c

ADOX When you create an Access table, several additional properties