using System;

using System.Reflection;

​

class ClassA 

{

    public ClassB classB { get; set; }

}

​

class ClassB : ClassC 

{

}

​

class ClassC 

{

    public string message { get; set; }

}

​

class ClassA2 : ClassB

{

}

​

public class Program

{

    private static void SetMessage(ClassC c, string message)

    {

        c.message = message;

    }

    private static T CreateInstanceOf<T>()

    {

        var obj = (T)Activator.CreateInstance(typeof(T));

        Type type = obj.GetType(); // this is the same as typeof(T)

        PropertyInfo prop = type.GetProperty("message");

        prop.SetValue(obj, "Hi");

        return obj;

    }

    public static void Main()

    {

        var c = CreateInstanceOf<ClassC>();

        Console.WriteLine("C works");

        var b = CreateInstanceOf<ClassB>();

        Console.WriteLine("B works");

​

        var a2 = CreateInstanceOf<ClassA2>();

        Console.WriteLine("A2 works");

        var a = CreateInstanceOf<ClassA>();

        // A doesn't work

    }

}