Shallow copying an object in C#

class ShallowCopyDemo { 
static void Main(string[] args) 
{ 
	
	Person p1 = new Person();
    p1.name = "Hassan";
    p1.age = 22;
    p1.ID = new PersonID(3343);
	
	// Calling ShallowCopy() method					 
	Person p2 = p1.ShallowCopy();
	System.Console.WriteLine("Before Changing: "); 
	
	// Value of attributes of c1 and c2 before changing
	// the values 
    System.Console.WriteLine("p1 instance values: ");
    System.Console.WriteLine("     Name: {0:s},   Age: {1:d}", p1.name, p1.age);
    System.Console.WriteLine("     Value: {0:d}", p1.ID.IDNumber);
    System.Console.WriteLine("p2 instance values:");
    
	System.Console.WriteLine("     Name: {0:s},   Age: {1:d}", p2.name, p2.age);
    System.Console.WriteLine("     Value: {0:d}", p2.ID.IDNumber);
	// Modifying attributes of p1
	p1.name = "Hamza";
    p1.age = 20;
    p1.ID.IDNumber = 4544;
	System.Console.WriteLine("\nAfter Changing attributes of p1: "); 
	
	// Value of attributes of c1 and c2 after changing
	// the values 
    System.Console.WriteLine("p1 instance values: ");
    System.Console.WriteLine("     Name: {0:s},   Age: {1:d}", p1.name, p1.age);
    System.Console.WriteLine("     Value: {0:d}", p1.ID.IDNumber);
    System.Console.WriteLine("p2 instance values:");
    
	System.Console.WriteLine("     Name: {0:s},   Age: {1:d}", p2.name, p2.age);
    System.Console.WriteLine("     Value: {0:d}", p2.ID.IDNumber);
	} 
} 
public class PersonID
{
    public int IDNumber;
    
    public PersonID(int id)
    {
        this.IDNumber = id;
    }
}
public class Person 
{
    public int age;
    public string name;
    public PersonID ID;
    public Person ShallowCopy()
    {
       return (Person) this.MemberwiseClone();
    }
}