Properties derived from MgNullableProperty are not serializing the m_nbIsNull member data.

[brucedechant]

All of the properties that are derived from MgNullableProperty are not serializing the m_bIsNull member data and this causes any IsNull() API check to always return "False" even for properties that are really NULL.

Example: (PHP code) This code will always return "False" which would cause you to read data from the reader that is invalid.

if($featureReader->IsNull($property)) {

$val = FormText::NullProperty;

} else {

$val = $featureReader->GetString($property);

}