after days of search (but few minutes from this post) I managed to get to it. Just override the wndproc and filter the WM_DEVICECHANGE message. :)

Thank you Robert for the reply. I did it and it did work, that has been a very good idea. Now I'm struggling with a couple of bitmap pointers but all the rest works properly. Sorry for the late reply but I was away for a while! Briga

Well things are weird. I also added an XML just for text. So I load the DB with .readxml and before using the Update methos I also save it to an XML file with WriteXML. In the beginning I got problem with XML in reading (not in saving) due to invalid values. I changed every field as nillable and now it works (XML). The Update method doesn't generate any exception anymore but the .mdb is empty. The new code is: DB.AcceptChanges() DB.WriteXml("c:\RF.XML") ' *** salvataggio XML conn.ConnectionString = String.Concat("Provider=Microsoft.Jet.OLEDB.4.0;Data source=", cfgDBDirectory, "\rfgprii.mdb") Try conn.Open() SelectCMD = New OleDb.OleDbCommand("SELECT * FROM Coordinate", conn) SelectCMD.CommandTimeout = 30 DBAdapter.SelectCommand = SelectCMD CustomCB = New OleDb.OleDbCommandBuilder(DBAdapter) DBAdapter.Update(DB.Coordinate) Catch ex As Exception MessageBox.Show(String.Concat("Errore nell'accesso alla base dati archivio:", ex.ToString), "RFGPRII", MessageBoxButtons.OK, MessageBoxIcon.Error) End Try Now I also put a rem in front of the .writexml just to see if that instruction was affecting the Update. Still it generates no exception but the .mdb is empty. So to recap the exception was due to the nillable parameter (although there were no null values) and it's gone. The problem now is that the Update method does not work. The DB is empty. Any clues? Thanks for the reply Briga