strConn = "PROVIDER=Microsoft.Jet.OLEDB.4.0;DATA SOURCE=" + Server.MapPath("Lam - Copia.mdb") + ";";               
Conn = new OleDbConnection(strConn);
                    strSQL = "Select MAX(Cod_Ord) From Ordini";
                    Conn.Open();
                    Cmd = new OleDbCommand(strSQL, Conn);
                    OleDbDataReader reader = Cmd.ExecuteReader();