BindingList <> evento Listchanged no activado

Question

tengo el siguiente código en mi aplicación. Pero el evento Listchanged no se activa como se esperaba. Tengo un objeto "Reserva". Estoy llamando esto desde frmMain. ¿Podría decirme el problema?

using System; 
using System.Collections.Generic; 
using System.Data; 
using System.Data.OleDb; 
using System.ComponentModel; 

namespace CustomObjects 
{ 
public class Booking:ObjectBase 
{ 

    private int pBookingNo=0; 
    private BindingList<Loans> pCashLoans = new BindingList<Loans>(); 

    public int BookingNo 
    { 
     get { return pBookingNo; } 
     set 
     { 
      if (!value.Equals(pBookingNo)) 
      { 
       pBookingNo = value; 
       PropertyHasChanged("BookingNo"); 
      } 
     } 
    } 

    public BindingList<Loans> CashLoans 
    { 
     get { return pCashLoans; } 
     set 
     { 
      pCashLoans = value; 
      //CalculateCashLoan(this,new System.ComponentModel.ListChangedEventArgs(ListChangedType.Reset,-1)); 
      PropertyHasChanged("CashLoans"); 
     } 
    } 

    private decimal pTakenCashLoan = 0; 
    public decimal TakenCashLoan 
    { 
     get { return pTakenCashLoan; } 
     set 
     { 
      pTakenCashLoan = value; 
      PropertyHasChanged("TakenCashLoan"); 
     } 
    } 

     public void CalculateCashLoan(object sender, ListChangedEventArgs args) 
    { 
     decimal total = 0; 
     foreach (Loans loan in pCashLoans) 
     { 
      total += loan.LoanAmount; 
     } 
     this.TakenCashLoan = total; 
    } 

    public Booking() 
    { 
     this.pCashLoans.ListChanged += this.CalculateCashLoan; 
    } 


    public static Booking FillEntity(OleDbDataReader Reader, OleDbConnection Connection) 
    { 
     Booking booking = new Booking(); 
     booking.BookingNo = (int)Reader["BookingNo"]; 

     booking.CashLoans = Loans.GetLoanList(booking.BookingNo, 1, Connection); 
     booking.MarkOld(); 
     return booking; 
    } 

    public static Booking GetEntity(int bookingNo, string ConnectionString) 
    { 
     Booking booking =new Booking(); 
     using (OleDbConnection Connection = new OleDbConnection(ConnectionString)) 
     { 
      string sqlSelect = "SELECT BookingNo FROM tblBooking WHERE BookingNo=" + bookingNo + ""; 
      using (OleDbCommand cmd = new OleDbCommand(sqlSelect, Connection)) 
      { 
       Connection.Open(); 
       OleDbDataReader bReader = cmd.ExecuteReader(); 
       if (bReader.HasRows) 
       { 
        bReader.Read(); 
        booking = FillEntity(bReader, Connection); 
       } 
       Connection.Close(); 

       if (!bReader.IsClosed) 
       { 
        bReader.Close(); 
       } 
      } 
     } 
     return booking; 
    } 

} 

} 

que llamo el código de aquí

private void frmMain_Load(object sender, EventArgs e) 
    { 
     AddDataBindings(); 
     cmbBookingType.DataSource = BookingType.GetSelectionList(ConnectionString.CreateConnectionStringForAccess("LOCAL", "2012")); 
    } 

    private Booking booking=new Booking(); 
    private void button1_Click(object sender, EventArgs e) 
    { 
     try 
     { 
      booking = Booking.GetEntity(1, ConnectionString.CreateConnectionStringForAccess("LOCAL", "2012")); 
      bsBooking.DataSource = booking; 
     } 
     catch (Exception Ex) 
     { 
      MessageBox.Show(Ex.Message); 
      MessageBox.Show(Ex.StackTrace); 
     } 
    } 

Answer 1

Es porque va a asignar un nuevo BindingList instancia a la propiedad en lugar de agregar y quitar elementos a la lista existente.

Intente hacer que la propiedad CashLoans sea de solo lectura, es decir, elimine el acceso del conjunto y modifique el código para borrar la lista y agregar los nuevos elementos.