Inheritance Topic

Question

using System;

class parent

{

   public void par()

   {

      C.WL("hello parent"); 

   } 

} 

class child:parent

{

   public void chil()

   {

      C.WL("hello Child"); 

   } 

} 

this type i have 50class

and if i want call this all class then i have to create Class instance if i have 500 class then again i have to  create 500 class instance then what is code reuse..? i have doubt. help me

i don't  want call n time i want create one object and call this all class object how please help me..