mysql> select Price from rates order by id;
+-------+
| Price |
+-------+
| 100   |
| 120   |
| 150   |
| 200   |
| 350   |
| 700   |
| 500   |
| 700   |
| 800   |
| 1300  |
| 1500  |
| 7000  |
| 8000  |
| 15000 |
| 20000 |
+-------+
15 rows in set

public List<string[]> ExecuteQuery(string command)
{
    com = new MySqlCommand(command, con);
    reader = com.ExecuteReader();
    if (reader.HasRows)
    {
        List<string[]> records = new List<string[]>();
        while (reader.Read())
        {
            string[] row = new string[reader.FieldCount];
            for (int i = 0; i < reader.RecordsAffected; i++)
                row[i] = reader[i].ToString();
            records.Add(row);
        }
        reader.Close();
        return records;
    }
    else
    {
        reader.Close();
        return new List<string[]>();
    }
}

MySqlCommand com = new MySqlCommand("select Access from useraccounts where Username = '" + tbxUsername.Text + "' and Pass = '" + tbxPassword.Text + ''', d.con);
object result = com.ExecuteScalar();