void UpdateList()
{
        listBox1->Items->Clear();
        oleDbConnection1->Open();
        System::Data::OleDb::OleDbCommand ^myCommand = gcnew OleDbCommand("SELECT lname FROM tab", oleDbConnection1);
        System::Data::OleDb::OleDbDataReader ^readerlname;
        System::Data::OleDb::OleDbDataReader ^readernumb;
        readerlname = myCommand->ExecuteReader();
        myCommand = gcnew OleDbCommand("SELECT znumber FROM tab", oleDbConnection1);
        readernumb = myCommand->ExecuteReader();
        while (readerlname->Read()&& readernumb->Read())
        {
                this->listBox1->Items->Add(readerlname->GetString(0)->ToString()+"("+readernumb->GetString(0)->ToString()+")");
        }

        readerlname->Close();
        readernumb->Close();
        oleDbConnection1->Close();
}