Message Passing in Object Oriented Programming

              Message passing is a method by which an object sends data to another object or requests other object to invoke method. This is also known as interfacing. It acts like a messenger from one object to other object to convey specific instructions.

The following Program explains about the message passing...

class Base     {         public Base()         { }         public Base(string s)         {             Console.WriteLine("hi " +s);         }     }     class Derived : Base     {                 public Derived(string s)         {             Base b = new Base(s);             Console.WriteLine(s);         }     }     class Program     {         static void Main(string[] args)         {             Derived d = new Derived("Krishna");             Console.ReadLine();         }     } Output: hi Krishna Krishna // Here Object d invokes the Constructor of base class that means object interaction will be takes place between Object d and Object b.