using System;

public class Program

{

    public static void Main()

    {

        var x = new DBManager("1", "1");

        Console.WriteLine(x.RO);

        var y = new DBManager("2", "2");

        Console.WriteLine(y.RO);

        Console.WriteLine(x.RO);

    }

}

​

public class Manager {

    private static string _readWriteConnectionString;

    private static string _readOnlyConnectionString;

    public Manager(string ro, string rw) {

        _readWriteConnectionString = rw;

        _readOnlyConnectionString = ro;

    }

    public string RO => _readOnlyConnectionString;

    public string RW => _readWriteConnectionString;

}

​

public class DBManager : Manager   {

    public DBManager(string ro, string rw) : base(ro, rw){

    }

}