using System;

​

public abstract class MyBaseClass

{

    public int MyProperty { get; set; }

}

​

public class MyDerivedClass : MyBaseClass

{

}

public class Program

{

    public static void Main()

    {

        MyDerivedClass obj1 = new MyDerivedClass();

        MyDerivedClass obj2 = new MyDerivedClass();

        obj1.MyProperty = 42;

        obj2.MyProperty = 100;

        Console.WriteLine("obj1.MyProperty = " + obj1.MyProperty);

        Console.WriteLine("obj2.MyProperty = " + obj2.MyProperty);

    }

}