Description of overload of Virtual Methods in C #

First, let's take a look at the example below,
Using system;

Abstract Public class contact
{
Public Virtual string prinf ()
{
Return ("this is a virtual method ");
}
}

Public class class1: Contact
{
Public String prinf ()
{
Return ("this is a new method"); // but this will cause a compilation warning, because a method with the same name has been inherited from the contact.
}
}
To compile the file, you only need to change the prinf statement
Public override string prinf ()
Or
Public New String prinf ()
However, the two statements are different,
See the following example:
Using system;

Abstract Public class contact
{
Public Virtual string prinf ()
{
Return ("this is a virtual method ");
}
}

Public class class1: Contact
{
Public override string prinf ()
{
Return ("this is a new method ");
}
}
Public class class2: Contact
{
Public New String prinf ()
{
Return ("this is another new method ");
}
}
Public class text
{
Public static void main ()
{
Contact [] contacts = new contact [2];
Contacts [0] = new class1;
Contacts [1] = new class2;
Foreach (contact CT in contacts)
{
Console. writeline (Ct. printf );
}
}
}

The final result is:

This is a new method.
This is a virtual Method

I didn't see "this is another new method", because class2 didn't reload the virtual method, but instead redefined a method!
This is the difference between the two !!! # C # column