Polymorphism of virtual objects and objects

Virtual memebers:

 Using  System;  Using  System. Collections. Generic;  Using  System. LINQ;  Using  System. text;  Namespace  Leleapplication2 {  Class  Person {  Public   String Firstname { Get ; Set  ;}  Public   String Secondname { Get ; Set  ;}  Public   Virtual   Void  Display () {console. writeline (  "  Person-{0}, {1}  "  , Firstname, secondname );} Public   Virtual   Int Calculateyearincome ( Int  Year ){  If (Year < 2000  ){  Return   50000  ;}  Return   10000  ;}}  Class Employee: person {  Public   Int Yearincome { Get ; Set  ;}  Public   Override   Void  Display () {console. writeline (  "  Employee-{0}, {1}, {2}  "  , Firstname, secondname, yearincome );} Public   Override   Int Calculateyearincome ( Int  Year ){  Return   1000  ;}}  Class  Program {  Static   Void Main ( String  [] ARGs) {list <Person> mylist =New List <person> (); Person p1 = New  Person (); p1.firstname = "  Nelson  "  ; P1.secondname = "  Laquest  "  ; Employee E1 = New  Employee (); e1.firstname = "  Whoa  "  ; E1.secondname = "  Hey  "  ; E1.yearincome = 23  ; Mylist. Add (P1); mylist. Add (E1 );  Foreach ( VaR Item In Mylist) {item. Display (); console. writeline (  "  Year income of 2004-> {0}  " , Item. calculateyearincome ( 2004  );} Console. readkey ();}  Static   String Getstring ( String  Prompt) {console. Write (  "  {0}>  " , Prompt );  Return  Console. Readline ();}}} 

 

 

Polymorphism:

 Using  System;  Using  System. Collections. Generic;  Using  System. LINQ;  Using  System. text;  Namespace  Leleapplication2 {  Class Person {  Public   String Firstname { Get ; Set  ;}  Public   String Secondname { Get ; Set  ;}  Public   Virtual   Void  Display () {console. writeline ( "  Person-{0}, {1}  "  , Firstname, secondname );}}  Class  Employee: person {  Public   Int Yearincome { Get ; Set  ;}  Public   Override   Void Display () {console. writeline (  "  Employee-{0}, {1}, {2}  "  , Firstname, secondname, yearincome );}}  Class  Program {  Static   Void Main ( String  [] ARGs) {list <Person> mylist = New List <person> (); For ( Int I = 0 ; I < 3 ; I ++ ) {Mylist. Add (getpersoninput ());}  Foreach ( VaR Item In  Mylist) {item. Display ();} console. readkey ();}  Static  Person getpersoninput (){  While ( True  ) {Console. writeline (  "  [1]-person \ n [2]-Employee  "  );  Int Choice = Int  . Parse (console. Readline ());  If (Choice = 1  ) {Person = New Person (); person. firstname = Getstring ( "  First name  "  ); Person. secondname = Getstring ( "  Second name  "  );  Return  Person ;}  Else   If (Choice = 2 ) {Employee = New  Employee (); employee. firstname = Getstring ( "  First name  "  ); Employee. secondname = Getstring ( "  Second name  "  ); Console. writeline (  "  Year of income> "  ); Employee. yearincome = Int  . Parse (console. Readline ());  Return  Employee ;}}}  Static   String Getstring ( String  Prompt) {console. Write (  "  {0}>  " , Prompt );  Return  Console. Readline ();}}}