1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64

using System;
 
namespace DoronAmir
{
    public abstract class Person
    {
 
        public virtual void Hello()
        {
            Console.WriteLine("Hello Person ");
        }
 
    }
 
    public class Student : Person
    {
 
        public override void Hello()
        {
            Console.WriteLine("Hello Student ");
        }
    }
 
    public class Worker : Person
    {
        public override void Hello()
        {
            Console.WriteLine("Hello Worker");
        }
 
        public void getWrkID()
        {
            Console.WriteLine(" Worker ID  123 ");
        }
 
    }
 
    public class MyClass
    {
        public static void Main()
        {
            Person[] arr = new Person[4];
 
            arr[0] = new Student();
            arr[1] = new Worker();
            arr[2] = new Student();
            arr[3] = new Worker();
 
 
            foreach (Person p in arr)
            {
                p.Hello();
 
                if (p is Worker)
                {
                    ((Worker)p).getWrkID();
                }
                Console.WriteLine("-----------------------------");
 
            }
 
        }
    }
}