Specifies the maximum number of characters that users can type in Property Editors of the current member. You can also specify the current member’s IModelMember.Size property in the Model Editor. If the value passed to the FieldSize attribute is more than the Size property value, Property Editors ignore the attribute. In the XPO data model, use the SizeAttribute instead of FieldSizeAttribute.
To specify the maximum number of characters that users can enter into a specific Property Editor, use the IModelMemberViewItem.MaxLength property.