.NET Basics:difference between new and override in inherite

using System;

namespace np
{

class program
{
    static void Main()
    {
        contact c1=new class1();
        contact c2=new class2();
        c1.printf();
        c2.printf();
        Console.ReadKey();
    }
}

 public abstract class contact
{
    public virtual void printf()
    {
        Console.WriteLine("This is virtual method.contact");
    }

}

public class class1:contact
{
    public override void printf(){
    Console.WriteLine("this is override Method class1!");
    }
}

public class class2:class1
{
    public new void printf()
    {
        Console.WriteLine("this is new method. class2");
    }
}


}

the result of this code:

    this is override Method class1!

    this is override Method class1!

 

New : hide the method of the Parent class.but if set a subclass to a parent(Polymorphism),when call the variable's method ,the parent's method will be called.

override: overwrite the parent 's method or properties.in Polymorphism, the subclass's method will be called.