C# Inheritance, adding new methods -

ok i've been searching while trying find anwer question difficult phrase asking here.

i'm inheriting class like

class (int a, int b, int c)  public a(int a, int b, int c) { }  class b :   public b(int a, int b, int c) base: (a, b, c)  public void blah(int something) {  } 

why can't , :

b classb = new b(1,2,3);  classb.blah(4); 

instead have do

public virtual void blah(int something) { }   

in class a, in class b:

public override void blah(int something) {  //method used in b not a. } 

so though have no intention of ever using method in class still have declare virtual? if i'm inheriting class c : b what? have declare stuff in c?

your assumption has no meaning, @ least as understood.

consider following example:

public class base {}  public class derived : base {     public void derivedspecificmethod() {     } } 

if

derived d = new derived(); //as specify in code example  d.derivedspecificmethod(); //you can this. 

the virtual may need in case when write:

base b = new derived(); //note, use base here on left side of equation b.derivedspecificvirtualmethod(); //virtual method call