using System;

​

public class BaseClass

{

​

    private static Random Rand = new Random();

    public static BaseClass CreateDerived()

    {

        return Rand.Next(1, 3) == 1 ? (BaseClass)new DerivedClass1() : new DerivedClass2();

    }

}

​

public class DerivedClass1 : BaseClass

{

    public DerivedClass1()

    {

        MyProperty = 1;

    }

​

    internal int MyProperty { get; set; }

}

​

public class DerivedClass2 : BaseClass

{

    public DerivedClass2()

    {

        MyProperty = 2;

    }

​

    internal int MyProperty { get; set; }

}

​

public class Program

{

    public static void Main()

    {

        BaseClass targetClass = BaseClass.CreateDerived();

​

        dynamic Casted = null;

        if (targetClass is DerivedClass1) 

        {

            Casted = (DerivedClass1)targetClass;

        } 

        else if (targetClass is DerivedClass2) 

        {

            Casted = (DerivedClass2)targetClass;

        } 

        else 

        {

            return;

        }

​

        Console.WriteLine(Casted.MyProperty); //Throws an exception here but works on VS!!

    }

}