Anyone used ComponentOne DataObject (Q3 or Q4) please help!

hi,
I want to do a test in the bussiness logic.
but seems it does not work.

I have a user table, and the Password column set as IsNotNull.
and I creat a DataDll as org.functionname.dataobject ,
and i add the connection and table to Scheam Designer just let designer set as default.
and then add a simple function as EncryptPassword(ByVal password As String) As Byte()
finally trigger the event in dataset_UserDetails_BeforeFieldChange,
set vale as
If e.Field.Name = "EncryptedPWD" Then

e.NewValue = EncryptPassword(e.NewValue)
and compile it. ---it is ok.

than i creat a window add few textboxs, lables , a c1navigator and add reference
to org.functionname.dll and bind all the textbox and c1navigator. ---compile ok.

but when i press the add button of navigator, a warning show up:
"Object can not tranfer DBNULL to anyother type"----ok go on
the nav show row 1 of 1 ( Table is blank )
and i add the vale into textbox and update or apply. a navigator warning show:
field "Password"can not be null or empty.

just can not add the value to it.

any idea what is wrong??

:( :( :confused:

i think it just a Type transfer problem. i just want the transfer String type to byte from the show page, and transfer byte to string from database.

Please!! anyone help!