Event and delegate

I was testing the code below (iHadi made some changes ); the goal: changes to the properties would notify any interested listeners;i need to use  the delegate and event). Why Show(object newValue) method is not working??? It does not display "Inside of Show() method"..

using System;


public delegate void EventDelegate(object newValue);
 
public class BankCustomer
{
private string _name;
private int _acctn;
 
public event EventDelegate PropertyChanged;
 
public String Name
{
    get { return _name; }
    set { _name = value; OnPropertyChanged(value); }
}
 
public int Acctn
{
    get { return _acctn; }
    set { _acctn = value; OnPropertyChanged(value); }
}
 
public BankCustomer(string n, int numb)
{
    _name = n;
    _acctn = numb;
}
 
public override bool Equals(object obj)
{
    if ((object)obj == null)
        return false;
 
    if (!(obj is BankCustomer))
        return false;
 
    return (this._name == (obj as BankCustomer)._name) && (this._acctn == (obj as BankCustomer)._acctn);
}
 
public override int GetHashCode()
{
    return this.ToString().GetHashCode();
}
 
public void DoIt(string newValue)
{
    PropertyChanged += new EventDelegate(Show);
}
 
public void Show(object newValue)
{
    Console.WriteLine("Inside of Show() method");
}
 
private void OnPropertyChanged(object newValue)
{
    // Check that the event has some methods attached to it before raising it.
    if (PropertyChanged != null)
        PropertyChanged(newValue);
}
}
 
 
class TestCust2
{
 
public static void Main()
{
    BankCustomer bob = new BankCustomer("Bob", 12345);
   
    Console.WriteLine("Bob's name before we called SET" );                  
    Console.WriteLine("Bob's name=" + bob.Name);
                                   
    bob.Name="Bob Green";  //
           
    Console.WriteLine("Bob's name After we called SET" );
    Console.WriteLine("Bob's name=" + bob.Name);

}
 
}
 

   


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