1 public class People
 2     {
 3         public People()
 4         {
 5             Console.WriteLine("father' custor");
 6         }
 7         public void Eat()
 8         {
 9             Console.WriteLine("father eat");
10         }
11     }
12     class Man : People
13     {
14         private int age;
15         public int Age
16         {
17             get 
18             {
19                 Console.WriteLine("age get");
20                 return age;
21             }
22             set
23             {
24                 Console.WriteLine("age set = ",value);
25                 age = value;
26             }
27         }
28         public Man()
29         {
30             Console.WriteLine("son's custor");
31         }
32         public void WhoEat()
33         {
34             base.Eat();
35         }
36         
37         public new void Eat()
38         {
39             base.Eat();
40             Console.WriteLine("son eat!");
41         }
42     }
43 
44     class Children :Man
45     {
46         public new void Eat() { Console.WriteLine("children eat!"); }
47     }