using System; 

class college { 

     public void collegeName() { 

        Console.WriteLine("PSG College Of Arts and Science"); 

    } 

  // virtual keyword is to override deptName() is subclass

    public virtual void deptName() { 

        Console.WriteLine("Dept Name"); 

    } 

} 

// computerScience class inherits College class

class computerScience : college 

{ 

    //deptName() is 'override' here 

    public override void deptName() 

    { 

        Console.WriteLine("Computer science department"); 

    } 

} 

​

class commerce : college 

{ 

    //'deptName()' is 'override' here 

    public override void deptName() 

    { 

        Console.WriteLine("Commerce department rules here"); 

    } 

} 

public class MainClass { 

    // Main Method 

    public static void Main() 

    { 

        college obj ;

        //obj is object of computerScience class

        obj= new computerScience();      

        obj.collegeName();

         // calls 'deptName()' of class 'computerScience' 

        obj.deptName();

        Console.WriteLine("--------------------------------");

        //obj is object of commerce class

        obj = new commerce();

        obj.collegeName();

         // calls 'deptName()' of class 'commerce' 

        obj.deptName();      

    } 

} 

​