private const string InsertDBTO = @"
                                INSERT INTO DOC ( cod, user, cccc, ine, sta,
                                                       ................. ,Code)
                                              VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?);  //BEN 27 COLONNE!!!
                                 "; 

  private void button1_Click(object sender, EventArgs e)
        {
private const string CnTO = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=db\\copia.mdb;User Id=admin;Password=;";

System.Data.OleDb.OleDbConnection cnUPDATE = new System.Data.OleDb.OleDbConnection();
            
            cnUPDATE.ConnectionString = CnTO;
            
    foreach (DataRow row in DT.Rows)
            {
               
                OleDbCommand cmdWrite = new OleDbCommand();
                cmdWrite.Connection = cnUPDATE;
                cmdWrite.CommandText = InsertDBTO
                cmdWrite.CommandType = CommandType.Text;

                for (int j = 0; j < row.Table.Columns.Count; j++)
                {
                    cmdWrite.Parameters.Add(
                        new OleDbParameter(row.Table.Columns[j].ColumnName,
                            row[j]));
                }

                cnUPDATE.Open();
               cmdWrite.ExecuteNonQuery();
                cnUPDATE.Close();
}