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class Program
{
static void Main()
{
object obj = Magic();
if (obj as B != null)
((B)obj).F();
else ((C)obj).F();
Console.ReadKey();
}
static object Magic()
{
if (new Random().Next(0, 10) < 5)
return new B();
else return new C();
}
}
abstract class A
{
public virtual void F() { }
}
class B : A
{
public override void F()
{
Console.WriteLine("B");
}
}
class C : A
{
public override void F()
{
Console.WriteLine("C");
}
}