=RowNum([Form])

Public Function RowNum(frm As Form) As Variant
On Error GoTo Err_RowNum
    With frm.RecordsetClone
        .Bookmark = frm.Bookmark
        RowNum = .AbsolutePosition + 1
    End With
Exit_RowNum:
    Exit Function
Err_RowNum:
    If Err.Number <> 3021& Then
        Debug.Print "RowNum() error " & Err.Number & " - " & Err.Description
    End If
    RowNum = Null
    Resume Exit_RowNum
End Function
Function GetLineNumberForm(f As Form)
    Dim rs As Recordset
    Dim frmMain As Form
    Dim frmCur As Form
    Dim strName As String
    Dim IsItSubForm As Boolean
    Dim strFName As String
    On Error Resume Next
    strFName = f.Parent.Name
    IsItSubForm = (Err = 0)
    On Error GoTo Err_GetLineNumber
    If IsItSubForm Then
        Set frmMain = f.Parent.Form
        strName = f.Name
        Set frmCur = frmMain(strName).Form
        Set rs = frmCur.RecordsetClone
    Else
        Set rs = f.RecordsetClone
        Set frmCur = f
    End If
        rs.Bookmark = frmCur.Bookmark
        GetLineNumberForm = rs.AbsolutePosition + 1
Bye_GetLineNumber:
       Set rs = Nothing
       Set frmMain = Nothing
       Set frmCur = Nothing
       Exit Function
Err_GetLineNumber:
       Resume Bye_GetLineNumber
End Function
Function Serialize(qryname As String, keyname As String, keyvalue) As Long
    Dim dbs As Database
    Dim rs As Recordset
    Set dbs = CurrentDb
    On Error GoTo Err_Serialize
    Set rs = dbs.OpenRecordset(qryname, dbOpenDynaset, dbReadOnly)
       On Error GoTo Err_Serialize
         Select Case rs.Fields(keyname).Type

            Case DB_INTEGER, DB_LONG, DB_CURRENCY, DB_SINGLE, _
            DB_DOUBLE, DB_BYTE
               rs.FindFirst "[" & keyname & "] = " & keyvalue

            Case DB_DATE
               rs.FindFirst "[" & keyname & "] = #" & keyvalue & "#"
            Case DB_TEXT
               rs.FindFirst "[" & keyname & "] = '" & keyvalue & "'"
            Case Else
               MsgBox "ERROR: Invalid key field data type!"
         End Select
        Serialize = Nz(rs.AbsolutePosition, 0) + 1
Err_Serialize:
        rs.Close
        dbs.Close
        Set rs = Nothing
        Set dbs = Nothing

End Function