public class Parent
{
	public virtual void Foo()
	{
		Console.WriteLine("Parent");
	}
}
public class Child: Parent
{

	protected virtual void Foo()
	{
		Console.WriteLine("Child");
	}

	/*public virtual void Foo()
	{
		Console.WriteLine("Child");
	}*/
	/*
	public static void Main()
	{
		Child a=new Child();
		a.Foo();
	}*/
}
public class Test 
{
	public static void Main()
	{
		Child a=new Child();
		a.Foo();
	}
}