Returns empty string if not implemented. Otherwise a string is returned with the format nn.nn.nnnn, where the first two digits are the major version, the second two digits are the minor version, and the last four digits are the release version. This value can be overridden by setting the TDBXPropertyNames.ProductVersion connection property. Note that TDBXPropertyNames.ProductVersion is the name of the property, not the property itself. 

TDBXPropertyNames